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

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

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

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

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

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.

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

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".

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

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

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

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

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

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 ---

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

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

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

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:

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

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,

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

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

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

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

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

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

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

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.

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

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

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