Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Gian Casalegno]

When looking for  astronomical data such as the Equation of Time, it is
important to choose a data source with an adequate level of accuracy.

It can be worthwhile to have a look at the article "Sun Ephemeris
Comparison" published on "Orologi Solari" n. 11 and available in English at
the following link:
http://www.sundials.eu/download/Comparison%20of%20sun%20ephemeris.pdf
This paper shows that one of the best available sources is the Android app
"Sol Et Umbra" that can be downloaded for free from the Google Play Store.

The same level of accuracy is obtained by the freeware Windows program "Sun
Ephemeris" http://www.sundials.eu/download/SunEphemeris_enu.html
It can also create a table including the daily EoT values for whichever
desired year.

It has been correctly underlined that the EoT changes year to year,
therefore the above mentioned data cannot be used outside of the year for
which they have been computed.
When EoT values are required for multi-year use then averaged values should
be used.
In "Orologi Solari" n. 5 a table has been published by Gianni Ferrari
including the averaged EoT values for the years 2014-2061.
It is included in the associated digital bonus.

Ciao.
Gian



2017-04-30 19:46 GMT+02:00 Beverly Stimpson :

>
> In message <82d3e73456.us...@interwebs.com>
>   Beverly Stimpson  wrote:
>
> >
> > If you need accurate solar 'transit times' (when the sun is exactly
> south),
> > for any geographic locations (showing CLOCK time corrected for Longitude
> in
> > a time-zone) for each day of the year, then you could contact Paul Ratto
> at
> > "SunClocks North America" - E-mail: sunclock...@icloud.com - who can
> supply
> > these details in the 'PDF' format, (if an Excel spreadsheet in
> unsuitable).
> >
> > Sincerely,
> >
> > Bev Stimpson.
> >
>
>
> In reply to an 'off-list' message I received, (plus to avoid discriminating
> against any list-members in the Southern hemisphere) - I have been asked to
> mention that a quite similar service (also giving details in PDF format) is
> available, showing times when the sun is due NORTH.  You can contact George
> Marshall, via his website - which is at URL:
> www.interactivesundials.com.au
>
> Sincerely,
>
> Bev Stimpson.
>
>
> --
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Beverly Stimpson]

In message <82d3e73456.us...@interwebs.com>
  Beverly Stimpson  wrote:

> 
> If you need accurate solar 'transit times' (when the sun is exactly south),
> for any geographic locations (showing CLOCK time corrected for Longitude in
> a time-zone) for each day of the year, then you could contact Paul Ratto at
> "SunClocks North America" - E-mail: sunclock...@icloud.com - who can supply
> these details in the 'PDF' format, (if an Excel spreadsheet in unsuitable).
> 
> Sincerely,
> 
> Bev Stimpson.
> 


In reply to an 'off-list' message I received, (plus to avoid discriminating
against any list-members in the Southern hemisphere) - I have been asked to
mention that a quite similar service (also giving details in PDF format) is
available, showing times when the sun is due NORTH.  You can contact George
Marshall, via his website - which is at URL: www.interactivesundials.com.au

Sincerely,

Bev Stimpson.


-- 
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[J. Tallman]

I use the Android app "Solar Coordinates" sometimes, it's worth a look and also 
free.

⁣Best,

Jim Tallman
Artisan Industrials

www.artisanindustrials.com
www.spectrasundial.com
jtall...@artisanindustrials.com
513-253-5497

This message is being sent remotely as I am currently out of the studio. Please 
excuse any further delay in response. ​

On Apr 30, 2017, 11:36 AM, at 11:36 AM, Brooke Clarke  
wrote:
>Hi:
>
>Remember that at that level of precision the value is only good for
>that particular year.  It will change over the 4
>year leap year cycle and keep changing over time.  A more accurate
>method would be to observe star meridian crossings,
>but that to is limited by "seeing".
>http://www.prc68.com/I/StellarTime.shtml
>
>--
>Have Fun,
>
>Brooke Clarke
>http://www.PRC68.com
>http://www.end2partygovernment.com/2012Issues.html
>
> Original Message 
>>
>> Hi Clark,
>>
>> The Solar Info android app provides the EqT value at all times and
>also generates the EqT curve at 12:00 for a date or
>> value of the Sun's declination for one year. It also provides these
>values in an Excel file.
>>
>> César Busto
>>
>>
>>
>> ---
>> https://lists.uni-koeln.de/mailman/listinfo/sundial
>>
>
>
>
>
>
>---
>https://lists.uni-koeln.de/mailman/listinfo/sundial
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Brooke Clarke]

Hi:

Remember that at that level of precision the value is only good for that particular year.  It will change over the 4 
year leap year cycle and keep changing over time.  A more accurate method would be to observe star meridian crossings, 
but that to is limited by "seeing".

http://www.prc68.com/I/StellarTime.shtml

--
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

 Original Message 


Hi Clark,

The Solar Info android app provides the EqT value at all times and also generates the EqT curve at 12:00 for a date or 
value of the Sun's declination for one year. It also provides these values in an Excel file.


César Busto



---
https://lists.uni-koeln.de/mailman/listinfo/sundial



---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Beverly Stimpson]

In message <8bd92972-2f02-4282-8b7a-dcb0a87a6...@compuserve.com>
  Patrick  wrote:

> You could also try http://ppowers.com/EoT.htm
> Patrick
> 

If you need accurate solar 'transit times' (when the sun is exactly south),
for any geographic locations (showing CLOCK time corrected for Longitude in
a time-zone) for each day of the year, then you could contact Paul Ratto at
"SunClocks North America" - E-mail: sunclock...@icloud.com - who can supply
these details in the 'PDF' format, (if an Excel spreadsheet in unsuitable).

Sincerely,

Bev Stimpson.


-- 

---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Patrick]

You could also try http://ppowers.com/EoT.htm
Patrick


Sent from my iPhone

> On 30 Apr 2017, at 09:51, César Busto  wrote:
> 
> Hi Clark,
>  
> The Solar Info android app provides the EqT value at all times and also 
> generates the EqT curve at 12:00 for a date or value of the Sun's declination 
> for one year. It also provides these values in an Excel file.
>  
> César Busto
>  
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
> 
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[César Busto]

Hi Clark,

The Solar Info android app provides the EqT value at all times and also 
generates the EqT curve at 12:00 for a date or value of the Sun's declination 
for one year. It also provides these values in an Excel file.

César Busto

---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year, for Equation of Time plaque

[Kenneth R clark]

 Thanks Bob and everyone else for their input.  The EQT really does change 
way into the future.
 
  I am leaning towards Kevin Karney website:  
http://www.precisedirections.co.uk/Sundials/index.html using a “Victorian EOT” 
table adding or subtracting minutes.  I could set it into the future 2050 and 
after that I am sure I will not be around or if the sundial is still standing.

Thanks,

Ken Clark   

Elizabethtown, PA
I tried sending this message by AOL account.  Just not working!


- Original Message -
From: "Robert Kellogg" 
To: sundial@uni-koeln.de
Sent: Friday, January 27, 2017 10:39:39 AM
Subject: RE: Looking for minutes and seconds correction for whole year, for 
Equation of Time plaque

I have used Pyephem (a Python programming module) for accurate 
computation of solar transit and have put it to service to compute EOT 
for Ken's latitude and longitude.  However, doing it to the second is 
pure fiction as the tropical year does not precisely repeat after 4 
years cycle ... and any one year in the 4 year cycle is off even more.

Bob


---
https://lists.uni-koeln.de/mailman/listinfo/sundial

---
https://lists.uni-koeln.de/mailman/listinfo/sundial

RE: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Dave Bell]

Thanks for reminding us of your work, Kevin!

That’s a lovely piece of JavaScrpt!

 

Dave

 

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Kevin Karney
Sent: Friday, January 27, 2017 2:40 AM
To: Kenneth R clark 
Cc: sundial@uni-koeln.de
Subject: Re: Looking for minutes and seconds correction for whole year for 
Equation of Time plaque

 

Hi Ken

I you want to observe how the Equation of Time varies over the years, go to my 
website

http://www.precisedirections.co.uk/Sundials/index.html

 

The second item may be of interest to you. It gives a table of EoTs (including 
the longitude correction for your time zone). And you can choose either a 
single year or a four year cycle.

For the four-year cycle, the average local noon EoT is calculated for each 
calendar date, except 29 Feb, which stands on its own. If you want the EoT 
without the longitude correction, set your longitude to your time zone 
longitude.

 

The calculations used are far more rigorous than needed for gnomonic purposes. 
They use the complete VSOP theory as described by Meeus and the EoT is 
topographical rather than geocentric (which only makes a marginal difference). 

If you use browser (like Chrome) which allows you to see the web-page source, 
you can see the calculations involved. (In Chrome, select View>Developer>View 
Source)

EoTs calculated have an accuracy of +/- .06 secs of time - using US Naval 
Observatory's MICA program as standard.

I think it is interesting to see how the 4-year table changes as one jumps 4 
years into the future...  

 

See the first item on the original page for comments on the calculations

and consider using a "Victorian EOT" table which gives all the information 
needed but in a tenth of the space

 

The Latitude/Longitude finder - using Google Earth is a bit ratty, but seems to 
work for Elizabethtown.

 

Let me know if you have any problems.

 

Best wishes

Kevin

 

 

On 26 Jan 2017, at 00:21, Kenneth R clark  > wrote:

 

I had an error message from AOL Sorry for no subject line and my files were not 
sent.

Let me retry with this account.

 

Hi everyone,

 

 I am working on my Equation of Time plaque for my aluminum cross sundial.  
All the instructions and graphics and EQT will be on an 8 ½” diameter ½” 
aluminum plate.  I do not want to use the standard graph found on many sundials 
but instead a chart for the whole year, mins and secs, to add or subtract total 
correction to get watch time.  I do not have much room for detailed 
instructions.

 

 I looked at difference sources for the chart and would like to verify the 
most accurate times to use the four year leap year cycle for a church at 
40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne and 
Shadows-(cannot input decimal degrees?)  Are there other sources or spreadsheet 
programs?

 

 I like to convey that sundials are accurate.  I envision that a person 
will wait till the shadow is on a line and the person will know what time it is 
suppose to be even though this type of sundial may not be design for precision.

 

 I made a quick drawing.  There will be some type of sun image at the top 
and a logo at the bottom for the location.  The chart in the center is from 
another project that I did just to see how it would look and if the printing is 
large enough to read.  I would have to change the inputs to standard time for 
the whole year.  I have also attached a picture of the sundial.

 

 I just want to know if I am using the right times and would appreciate any 
comments or suggestions.

 

Thanks very much

 

Ken Clark   

Elizabethtown, 
PA

---
  
https://lists.uni-koeln.de/mailman/listinfo/sundial

 

---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Thibaud Taudin Chabot]

Some time ago when I was able to use the 
mainframe computer of my employer I made a list 
of declination and time equation for each day for 
the years 2000-2099 and calculated the mean 
values for each date. I found the list again and 
attach it for who is interested.

Thibaud


Hi everyone,


 I am working on my Equation of Time plaque 
for my aluminum cross sundial.  All the 
instructions and graphics and EQT will be on an 
8 ½” diameter ½” aluminum plate.  I do not want 
to use the standard graph found on many 
sundials but instead a chart for the whole 
year, mins and secs, to add or subtract total 
correction to get watch time.  I do not have 
much room for detailed instructions.



 I looked at difference sources for the 
chart and would like to verify the most 
accurate times to use the four year leap year 
cycle for a church at 40.1526N, 76.6038W.   I 
have looked at the Solar Noon calculator, Sonne 
and Shadows-(cannot input decimal 
degrees?)  Are there other sources or spreadsheet programs?



 I like to convey that sundials are 
accurate.  I envision that a person will wait 
till the shadow is on a line and the person 
will know what time it is suppose to be even 
though this type of sundial may not be design for precision.



 I made a quick drawing.  There will be 
some type of sun image at the top and a logo at 
the bottom for the location.  The chart in the 
center is from another project that I did just 
to see how it would look and if the printing is 
large enough to read.  I would have to change 
the inputs to standard time for the whole 
year.  I have also attached a picture of the sundial.



 I just want to know if I am using the 
right times and would appreciate any comments or suggestions.



Thanks very much


Ken 
Clark 
Elizabethtown, PA



https://lists.uni-koeln.de/mailman/listinfo/sundial
---
https://lists.uni-koeln.de/mailman/listinfo/sundial



--
Th. Taudin Chabot, . tcha...@dds.nl



Mean values declination sun and time equation at 12:00 GMT
calculated over the years 2000 - 2099
==
   Day   - Declination sun    -- time equation ---
DatenrDD:MM:SS.ssDD.ddSSS.ssH:MM:SS.ssH.hh
--
01JAN   1-22:58:00.38   -22.966771   -211.953356   -0:03:31.95   -0.058876
02JAN   2-22:52:40.95   -22.878043   -239.917845   -0:03:59.92   -0.066644
03JAN   3-22:46:54.21   -22.781725   -267.534094   -0:04:27.53   -0.074315
04JAN   4-22:40:40.32   -22.677866   -294.772817   -0:04:54.77   -0.081881
05JAN   5-22:33:59.46   -22.566516   -321.605383   -0:05:21.61   -0.089335
06JAN   6-22:26:51.82   -22.447729   -348.003856   -0:05:48.00   -0.096668
07JAN   7-22:19:17.63   -22.321563   -373.941044   -0:06:13.94   -0.103873
08JAN   8-22:11:17.09   -22.188079   -399.390535   -0:06:39.39   -0.110942
09JAN   9-22:02:50.43   -22.047343   -424.326734   -0:07:04.33   -0.117869
10JAN   10   -21:53:57.92   -21.899421   -448.724903   -0:07:28.72   -0.124646
11JAN   11   -21:44:39.79   -21.744385   -472.561195   -0:07:52.56   -0.131267
12JAN   12   -21:34:56.31   -21.582309   -495.812681   -0:08:15.81   -0.137726
13JAN   13   -21:24:47.77   -21.413269   -518.457388   -0:08:38.46   -0.144016
14JAN   14   -21:14:14.45   -21.237347   -540.474318   -0:09:00.47   -0.150132
15JAN   15   -21:03:16.64   -21.054623   -561.843480   -0:09:21.84   -0.156068
16JAN   16   -20:51:54.66   -20.865184   -582.545908   -0:09:42.55   -0.161818
17JAN   17   -20:40:08.82   -20.669116   -602.563685   -0:10:02.56   -0.167379
18JAN   18   -20:27:59.44   -20.466511   -621.879958   -0:10:21.88   -0.172744
19JAN   19   -20:15:26.85   -20.257459   -640.478956   -0:10:40.48   -0.177911
20JAN   20   -20:02:31.40   -20.042056   -658.346003   -0:10:58.35   -0.182874
21JAN   21   -19:49:13.43   -19.820398   -675.467526   -0:11:15.47   -0.187630
22JAN   22   -19:35:33.30   -19.592582   -691.831067   -0:11:31.83   -0.192175
23JAN   23   -19:21:31.36   -19.358710   -707.425286   -0:11:47.43   -0.196507
24JAN   24   -19:07:07.98   -19.118883   -722.239967   -0:12:02.24   -0.200622
25JAN   25   -18:52:23.54   -18.873204   -736.266017   -0:12:16.27   -0.204518
26JAN   26   -18:37:18.40   -18.621779   -749.495468   -0:12:29.50   -0.208193
27JAN   27   -18:21:52.97   -18.364713   -761.921470   -0:12:41.92   -0.211645
28JAN   28   -18:06:07.61   -18.102114   -773.538288   -0:12:53.54   -0.214872
29JAN   29   -17:50:02.72   -17.834090   -784.341294   -0:13:04.34   -0.217873
30JAN   30   -17:33:38.71   -17.560752   -794.326959   -0:13:14.33   -0.220646
31JAN   31   -17:16:55.95   -17.282209   -803.492836   -0:13:23.49   -0.223192
01FEB   32   -16:59:54.87   -16.998574   -811.837555   

RE: Looking for minutes and seconds correction for whole year, for Equation of Time plaque

[Robert Kellogg]

I have used Pyephem (a Python programming module) for accurate 
computation of solar transit and have put it to service to compute EOT 
for Ken's latitude and longitude.  However, doing it to the second is 
pure fiction as the tropical year does not precisely repeat after 4 
years cycle ... and any one year in the 4 year cycle is off even more.


Bob


---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Kevin Karney]

Hi Ken
I you want to observe how the Equation of Time varies over the years, go to my 
website
http://www.precisedirections.co.uk/Sundials/index.html

The second item may be of interest to you. It gives a table of EoTs (including 
the longitude correction for your time zone). And you can choose either a 
single year or a four year cycle.
For the four-year cycle, the average local noon EoT is calculated for each 
calendar date, except 29 Feb, which stands on its own. If you want the EoT 
without the longitude correction, set your longitude to your time zone 
longitude.

The calculations used are far more rigorous than needed for gnomonic purposes. 
They use the complete VSOP theory as described by Meeus and the EoT is 
topographical rather than geocentric (which only makes a marginal difference). 
If you use browser (like Chrome) which allows you to see the web-page source, 
you can see the calculations involved. (In Chrome, select View>Developer>View 
Source)
EoTs calculated have an accuracy of +/- .06 secs of time - using US Naval 
Observatory's MICA program as standard.
I think it is interesting to see how the 4-year table changes as one jumps 4 
years into the future...  

See the first item on the original page for comments on the calculations
and consider using a "Victorian EOT" table which gives all the information 
needed but in a tenth of the space

The Latitude/Longitude finder - using Google Earth is a bit ratty, but seems to 
work for Elizabethtown.

Let me know if you have any problems.

Best wishes
Kevin


> On 26 Jan 2017, at 00:21, Kenneth R clark  wrote:
> 
> I had an error message from AOL Sorry for no subject line and my files were 
> not sent.
> Let me retry with this account.
> 
> Hi everyone,
> 
>  I am working on my Equation of Time plaque for my aluminum cross 
> sundial.  All the instructions and graphics and EQT will be on an 8 ½” 
> diameter ½” aluminum plate.  I do not want to use the standard graph found on 
> many sundials but instead a chart for the whole year, mins and secs, to add 
> or subtract total correction to get watch time.  I do not have much room for 
> detailed instructions.
> 
>  I looked at difference sources for the chart and would like to verify 
> the most accurate times to use the four year leap year cycle for a church at 
> 40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne and 
> Shadows-(cannot input decimal degrees?)  Are there other sources or 
> spreadsheet programs?
> 
>  I like to convey that sundials are accurate.  I envision that a person 
> will wait till the shadow is on a line and the person will know what time it 
> is suppose to be even though this type of sundial may not be design for 
> precision.
> 
>  I made a quick drawing.  There will be some type of sun image at the top 
> and a logo at the bottom for the location.  The chart in the center is from 
> another project that I did just to see how it would look and if the printing 
> is large enough to read.  I would have to change the inputs to standard time 
> for the whole year.  I have also attached a picture of the sundial.
> 
>  I just want to know if I am using the right times and would appreciate 
> any comments or suggestions.
> 
> Thanks very much
> 
> Ken Clark 
>   
> 
> Elizabethtown, PA
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial 
> 
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

RE: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Jack Aubert]

HI Simon,

 

I like to use the “time of solar transit” version of the EOT from your 
spreadsheet because I can never remember with any confidence if I am correcting 
the watch or the dial.

 

Jack Aubert

 

 

From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Simon Wheaton 
Smith
Sent: Wednesday, January 25, 2017 8:08 PM
To: Kenneth R clark 
Cc: sundial@uni-koeln.de
Subject: Re: Looking for minutes and seconds correction for whole year for 
Equation of Time plaque

 

Last email from me today...

 

here is the 4 year EOT from my main book

 

Simon

 

On Wed, Jan 25, 2017 at 5:21 PM, Kenneth R clark  > wrote:

I had an error message from AOL Sorry for no subject line and my files were not 
sent.

Let me retry with this account.

 

Hi everyone,

 

 I am working on my Equation of Time plaque for my aluminum cross sundial.  
All the instructions and graphics and EQT will be on an 8 ½” diameter ½” 
aluminum plate.  I do not want to use the standard graph found on many sundials 
but instead a chart for the whole year, mins and secs, to add or subtract total 
correction to get watch time.  I do not have much room for detailed 
instructions.

 

 I looked at difference sources for the chart and would like to verify the 
most accurate times to use the four year leap year cycle for a church at 
40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne and 
Shadows-(cannot input decimal degrees?)  Are there other sources or spreadsheet 
programs?

 

 I like to convey that sundials are accurate.  I envision that a person 
will wait till the shadow is on a line and the person will know what time it is 
suppose to be even though this type of sundial may not be design for precision.

 

 I made a quick drawing.  There will be some type of sun image at the top 
and a logo at the bottom for the location.  The chart in the center is from 
another project that I did just to see how it would look and if the printing is 
large enough to read.  I would have to change the inputs to standard time for 
the whole year.  I have also attached a picture of the sundial.

 

 I just want to know if I am using the right times and would appreciate any 
comments or suggestions.

 

Thanks very much

 

Ken Clark   

Elizabethtown, 
PA


---
https://lists.uni-koeln.de/mailman/listinfo/sundial







 

-- 

Simon Wheaton-Smith

www.illustratingshadows.com  

Phoenix, AZ

W 112.1, N 33.5

---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Gian Casalegno]

Sorry for the mail with no subject: it's because it was an answer to Ken's
e-mail.
Here is the text again.

The program "Orologi Solari" can provide a table too (as well as a graph in
several formats) of the Equation of Time, including or not the longitude
difference, as desired.

Values are from Gianni Ferrari study, published on the Italian magazine
"Orologi Solari" n. 5, where he computed the EoT mean value in the years
2014-2061.
>From the same source you can also get an Excel file containing the original
Ferrari's table.
In my opinion this the best choice for a sundial that will be hopefully
used for many years in the future: a 4 years mean value will not give a
correct reading after 30 years (have a look at the article for the
evaluation of the exact resulting errors).

Also note that EoT values are usually computed at 12 AM UTC (this is indeed
the case for Orologi Solari) and you should correct them to move to your
time zone.

Ciao.
Gian Casalegno

2017-01-26 1:21 GMT+01:00 Kenneth R clark :

> I had an error message from AOL Sorry for no subject line and my files
> were not sent.
>
> Let me retry with this account.
>
>
> Hi everyone,
>
>
>  I am working on my Equation of Time plaque for my aluminum cross
> sundial.  All the instructions and graphics and EQT will be on an 8 ½”
> diameter ½” aluminum plate.  I do not want to use the standard graph found
> on many sundials but instead a chart for the whole year, mins and secs, to
> add or subtract total correction to get watch time.  I do not have much
> room for detailed instructions.
>
>
>  I looked at difference sources for the chart and would like to verify
> the most accurate times to use the four year leap year cycle for a church
> at 40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne
> and Shadows-(cannot input decimal degrees?)  Are there other sources or
> spreadsheet programs?
>
>
>  I like to convey that sundials are accurate.  I envision that a
> person will wait till the shadow is on a line and the person will know what
> time it is suppose to be even though this type of sundial may not be design
> for precision.
>
>
>  I made a quick drawing.  There will be some type of sun image at the
> top and a logo at the bottom for the location.  The chart in the center is
> from another project that I did just to see how it would look and if the
> printing is large enough to read.  I would have to change the inputs to
> standard time for the whole year.  I have also attached a picture of the
> sundial.
>
>
>  I just want to know if I am using the right times and would
> appreciate any comments or suggestions.
>
>
> Thanks very much
>
>
> Ken Clark
>
>
> Elizabethtown, PA
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[J. Tallman]

Hi Ken,

I use the 4 year average values from Waugh. When I originally designed the 
Spectra in 2001 that was the best resource available to me, but there are many 
applications now that you can use to check the values. Orologi Solari is very 
good for lots of reasons, and I use Shadows as well.

There are several Android apps that give EOT too...I like Sol et Umbra, but 
most if not all the apps I have seen give EOT on a daily basis, I don't think 
any of them give the whole year at once like you showed.

When I made my EOT chart for the Spectra which is common to every dial that I 
make (longitude correction is added to the hour lines) Tony Moss advised me to 
create the chart and plot the line myself, and in my case I used Adobe 
Illustrator to do that. I'm glad I did, as it seemed like a suitable rite of 
passage for a professional dial maker. I believe you can also use Excel to do 
it, if a chart is what you need.

Hope this helps. I'll bet you could find something on the NASS Repository disk 
as well.

⁣Best, 

Jim Tallman
www.artisanindustrials.com 
www.spectrasundial.com 
jtall...@artisanindustrials.com 
513-253-5497 

This message is being sent remotely as I am currently out of the studio. Please 
excuse any further delay in response. ​


On Jan 25, 2017, at 7:21 PM, Kenneth R clark  wrote:

I had an error message from AOL Sorry for no subject line and my files were not 
sent.

Let me retry with this account.


Hi everyone,


 I am working on my Equation of Time plaque for my aluminum cross sundial.  
All the instructions and graphics and EQT will be on an 8 ½” diameter ½” 
aluminum plate.  I do not want to use the standard graph found on many sundials 
but instead a chart for the whole year, mins and secs, to add or subtract total 
correction to get watch time.  I do not have much room for detailed 
instructions.


 I looked at difference sources for the chart and would like to verify the 
most accurate times to use the four year leap year cycle for a church at 
40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne and 
Shadows-(cannot input decimal degrees?)  Are there other sources or spreadsheet 
programs?


 I like to convey that sundials are accurate.  I envision that a person 
will wait till the shadow is on a line and the person will know what time it is 
suppose to be even though this type of sundial may not be design for precision.


 I made a quick drawing.  There will be some type of sun image at the top 
and a logo at the bottom for the location.  The chart in the center is from 
another project that I did just to see how it would look and if the printing is 
large enough to read.  I would have to change the inputs to standard time for 
the whole year.  I have also attached a picture of the sundial.


 I just want to know if I am using the right times and would appreciate any 
comments or suggestions.


Thanks very much


Ken Clark                                                                       
                                                                                
                                                                Elizabethtown, 
PA


https://lists.uni-koeln.de/mailman/listinfo/sundial

On Jan 25, 2017, 7:21 PM, at 7:21 PM, Kenneth R clark   
wrote:
>
>I had an error message from AOL Sorry for no subject line and my files
>were not sent. 
>Let me retry with this account. 
>
>
>Hi everyone, 
>
>
>I am working on my Equation of Time plaque for my aluminum cross
>sundial. All the instructions and graphics and EQT will be on an 8 ½”
>diameter ½” aluminum plate. I do not want to use the standard graph
>found on many sundials but instead a chart for the whole year, mins and
>secs, to add or subtract total correction to get watch time. I do not
>have much room for detailed instructions. 
>
>
>I looked at difference sources for the chart and would like to verify
>the most accurate times to use the four year leap year cycle for a
>church at 40.1526N, 76.6038W. I have looked at the Solar Noon
>calculator, Sonne and Shadows-(cannot input decimal degrees?) Are there
>other sources or spreadsheet programs? 
>
>
>I like to convey that sundials are accurate. I envision that a person
>will wait till the shadow is on a line and the person will know what
>time it is suppose to be even though this type of sundial may not be
>design for precision. 
>
>
>I made a quick drawing. There will be some type of sun image at the top
>and a logo at the bottom for the location. The chart in the center is
>from another project that I did just to see how it would look and if
>the printing is large enough to read. I would have to change the inputs
>to standard time for the whole year. I have also attached a picture of
>the sundial. 
>
>
>I just want to know if I am using the right times and would appreciate
>any comments or suggestions. 
>
>
>Thanks very much 
>
>
>Ken Clark Elizabethtown, PA
>

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[Simon Wheaton Smith]

Last email from me today...

here is the 4 year EOT from my main book

Simon

On Wed, Jan 25, 2017 at 5:21 PM, Kenneth R clark 
wrote:

> I had an error message from AOL Sorry for no subject line and my files
> were not sent.
>
> Let me retry with this account.
>
>
> Hi everyone,
>
>
>  I am working on my Equation of Time plaque for my aluminum cross
> sundial.  All the instructions and graphics and EQT will be on an 8 ½”
> diameter ½” aluminum plate.  I do not want to use the standard graph found
> on many sundials but instead a chart for the whole year, mins and secs, to
> add or subtract total correction to get watch time.  I do not have much
> room for detailed instructions.
>
>
>  I looked at difference sources for the chart and would like to verify
> the most accurate times to use the four year leap year cycle for a church
> at 40.1526N, 76.6038W.   I have looked at the Solar Noon calculator, Sonne
> and Shadows-(cannot input decimal degrees?)  Are there other sources or
> spreadsheet programs?
>
>
>  I like to convey that sundials are accurate.  I envision that a
> person will wait till the shadow is on a line and the person will know what
> time it is suppose to be even though this type of sundial may not be design
> for precision.
>
>
>  I made a quick drawing.  There will be some type of sun image at the
> top and a logo at the bottom for the location.  The chart in the center is
> from another project that I did just to see how it would look and if the
> printing is large enough to read.  I would have to change the inputs to
> standard time for the whole year.  I have also attached a picture of the
> sundial.
>
>
>  I just want to know if I am using the right times and would
> appreciate any comments or suggestions.
>
>
> Thanks very much
>
>
> Ken Clark
>
>
> Elizabethtown, PA
>
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
>
>


-- 
Simon Wheaton-Smith
www.illustratingshadows.com
Phoenix, AZ
W 112.1, N 33.5


4yearEOT.pdf
Description: Adobe PDF document
---
https://lists.uni-koeln.de/mailman/listinfo/sundial

Re: Looking for minutes and seconds correction for whole year for Equation of Time plaque

[illustratingshad...@gmail.com]

there are many excellent sources for that which you seek.
my own offering would be my 
illustratingshadows.xls
on my Web site which has an astronomically appropriate worksheet, decimal lat 
and long are used, not minutes and seconds.
And I have also averaged 4 years of them in
supplemental Shadows.pdf
also on my Web site:-
www.illustratingshadows.com   

Simon


Sent from Yahoo Mail on Android 
 
  On Wed, Jan 25, 2017 at 17:21, Kenneth R clark wrote: 
  
I had an error message from AOL Sorry for no subject line and my files were not 
sent.

Let me retry with this account.




Hi everyone,




 I am working onmy Equation of Time plaque for my aluminum cross sundial.  
All the instructions and graphics and EQT willbe on an 8 ½” diameter ½” 
aluminum plate. I do not want to use the standard graph found on many sundials 
butinstead a chart for the whole year, mins and secs, to add or subtract 
totalcorrection to get watch time.  I do nothave much room for detailed 
instructions.




 I looked atdifference sources for the chart and would like to verify the 
most accurate timesto use the four year leap year cycle for a church at 
40.1526N, 76.6038W.   I have looked at the Solar Noon calculator,Sonne and 
Shadows-(cannot input decimal degrees?)  Are there other sources or spreadsheet 
programs?




 I like to conveythat sundials are accurate.  I envisionthat a person will 
wait till the shadow is on a line and the person will knowwhat time it is 
suppose to be even though this type of sundial may not be designfor precision.




 I made a quickdrawing.  There will be some type of sunimage at the top and 
a logo at the bottom for the location.  The chart in the center is from 
anotherproject that I did just to see how it would look and if the printing is 
large enoughto read.  I would have to change theinputs to standard time for the 
whole year. I have also attached a picture of the sundial.




 I just want toknow if I am using the right times and would appreciate any 
comments orsuggestions.




Thanks very much




Ken Clark                                                                       
                                                                                
                                                                Elizabethtown,PA
  
---
https://lists.uni-koeln.de/mailman/listinfo/sundial