Is it really necessary to throw in your political right wing spin when
answering a simple question?
On 2018-09-10 23:31, Roger wrote:
Perhaps it is the nanny state insisting on things that restrict
freedom “for your protection”.
---
The unfortunate thing is that many that can actually afford to buy it
likely won't have a clue what it represents.
On 2017-03-19 19:01, Dan-George Uza wrote:
Hello,
Here's an interesting wristwatch from this year that shows the
Equation of Time in a clever way. "Sex on a wrist!" - to quote
True, but if I can get 125 sponsors of $400 each I can write you a
smartphone app that has all the same features, looks similiar, and is 10
times more accurate - and it will adjust to your local timezone and
labelling in 10 languages to boot :)
2017-01-16 21:42, J. Tallman wrote:
It is
They returned to one of the other British North American colonies, Nova
Scotia.
Yes - there where more than 13 British colonies in North America in the
1770s. :)
On 2016-03-17 22:38, kool...@dickkoolish.com wrote:
In Boston MA USA, today was Evacuation Day, which
celebrates the evacuation
http://hyperallergic.com/260217/olafur-eliassons-sundial-of-melting-icebergs-clocks-in-at-half-past-wasteful/
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
They are east-west lines, but they are not straight. They are circles.
On 2015-09-15 12:30, Brent wrote:
If I was in halifax at sunrise on the equinox and the earth stopped
rotating and I walked due east (towards the sun) across the ocean
I would end up in Southern Spain and not on my same
We are in the midst of developing a sundial app for iOS and Andriod. We
don't have a timeframe for release yet, though.
The app, as designed, will also work on Windows, and OSX (Mac).
We are interested in receiving feature requests, so if there are things
you would like to see in a sundiial
Merry 358 and Happy 1, or is it Merry 357 and Happy 0 :)
On 2015-01-06 18:07, John Pickard wrote:
If nothing else, the replies show that dates are rather tricky things
with some interesting mathematics behind them. Wouldn't it be simpler
to move to decimal time and a decimal calendar? (NOT a
Two sequential Friday 13ths can only happen on Feb March, and only in
non-leap years. So, i would guess it happens 3/28 years, or about 11% of
the time.
On 2015-01-05 16:35, John Pickard wrote:
Good morning all, and a happy 2015 to everyone.
Looking at my diary this morning, I noticed that
To get your mean coordinates of a particular equinox into apparent
coordinates for a particular date, you will have to make a few
calculations
1) apply proper motion of polaris until the new date
2) precess the result to the new date
3) convert to ecliptic cordinates using the mean
I also write astronomical algorithms and astronomical software. And I
also use Meeus for my inspiration.
Meeus, though an astronomer, also recommends measuring from South, but I
have decided over several astronomical products to continue measuring
from North, which more laymen are familiar
.
Most planetarium programs use the 'Bright Star Catalog'. Scientific data
is generally free, as well as the formulas, if you know what you are
looking for.
David Patte
P.S. I have also writen Sundial Simulators, by the way.
On 2014-05-22 3:56, Astrovisuals wrote:
I wonder if anyone can help
32 bit apps in general should run fine on 64bit, but they may still have
16 bit installers. In this case you may have to install them on 64 bit
machines using 'compatibility mode'.
On 2013-12-14 11:14, J. Tallman wrote:
Hello All,
A previous thread discussed the issues with some of the older
Refraction affects apparent altitude at a particular time. The apparent
azimuth at a particular time does not change.
But the time of sunrise/sunset is changed due to refraction, so
therefore there is a different solar azimuth at this adjusted time.
On 2013-11-13 11:28, Frank King wrote:
In Canada, I am waiting for 13-12-11 10:09 = 2013, December 11th at
10:09 in the morning.
On 2013-11-12 13:43, Willy Leenders wrote:
You can also come to Europe, Bill.
In my country, 11/12/13 is the eleventh day of December 2013
Willy Leenders
Hasselt in Flanders (Belgium)
Visit my website
Just a note of caution to say that someone is sending emails on and off
this list claiming to be me, or claiming to work for my software/website
development company.
The emails seem to be related to a posting from last April referring to
'human sundials' originally posted by a 'Reena Gagneja'
A good chance for me to plug my Free Windows App (Time Zone Master) from
relativedata.com, which gives
Sunrise6:54 CLT
Transit12:42:06 CLT
Sunset 18:29 CLT
Moonrise5:05 CLT
Transit11:59:33 CLT
Moonset 17:57 CLT
Also has local mean and apparent time, phase times and season
I just checked using Time Zone Master
The sign of the equation of time indeed did change on April 15, 1707 -
at very close to 21:00 UT
On 2013-04-15 5:03, Frank King wrote:
Dear John,
Tee hee...
The EoT might change sign on Euler's
306th birthday but I very much doubt
(without
Yes, at the point of intersection they are, but don't forget though that
lat and long are great circles, not straight lines.
Of course, there is no east or west at the poles.
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
True - correction accepted, except at the equator :)
I wonder if the poles have infinitely small latitude 'circles' ;)
On 2013-04-10 22:02, kool...@dickkoolish.com wrote:
While longitude lines are great circles, latitude
lines are small circles.
David Patte wrote:
Yes, at the point
Yes the distance around the equator is larger than twice the distance
from pole to pole. The flattening of the earth (oblateness) is minor
though. I can find the exact number if you are interested. I write
astronomy software that has to take this into effect.
actually - latitude (contrary to
If I'm not mistaken:
25,000 x 6 mm = 150,000 mm = 150m, not 1500m
Did you mean cm?
On 2012-06-25 0:11, Roger Bailey wrote:
At this time I am moving 6 mm per year towards the east, as determined
by precise GPS and laser surveys. Over 25,000 years this movement is a
mile, 1.5 km and a lot of
I clearly saw venus with my eclipse shades, but I wore them over my eye
glasses.
On 2012-06-11 16:09, RW Mail List wrote:
Hi all,
I have two Eclipse Shades that I tried to use to view the transit of
Venus on the 6th June 2012 (Australia). I could see the sun but I
couldn’t see Venus. For
From a point on the moon, the suns motion is probably not smooth enough to
build a usable sundial to measure a lunar day (which is close to a terrestrial
month).
And using 'earth light' on a lunar based dial would probably not be very
effective either, since the earth's position in the lunar
Refraction?
On 2012-03-19 23:47, Tom Laidlaw wrote:
Hello the list,
So them vernal/autumnal equinox is just about an hour away. I was
looking at several epemerides expedting that at solar noon tomorrow
the altitude of the sun would equal my latitude (45.6N), but it seems
to be about a degree
I believe the original definition of a kilometer was based on 1/1 of
the distance from a pole to the equator.
metre was On 2012-03-18 21:52, Hank de Wit wrote:
Hello Axel,
I think you have made a mistake with the number 40231.264 (miles?).
If you take the formula for size of a latitude
Not sure what you did wrong, but you can download Time Zone Master for
free from www.relativedata.com which shows sundial time for any
location, and corrects for EoT, light refraction, aberration, nutation
and precession, as well as any of about 100 different timezone rules.
On 2011-10-13
Just for clarity:
http://aa.usno.navy.mil/data/docs/EarthSeasons.php shows the following
UT values:
20112011
Perihelion Jan 3 19Equinoxes Mar 20 23 21Sept 23 09 05
AphelionJuly 4 15Solstices June 21 17 16Dec 22 05 30
ie: 9:05 UT
from
Also using Time Zone Master
1) Clicking any clock and going to the equinox page, you then click on
the equinox (5:05 EDT for my case - Ottawa)
2) Then go to the sidereal page it shows 9:12:28 GST (sidereal time)
3) The time difference to noon is 2h 57m 31s
Multiply x 15 - you get 44d 22m 45s E
in Somalia, near the Kenya
border, where the sun will be overhead at solar noon, at the equinox
On 2011-09-23 2:12, David Patte wrote:
Also using Time Zone Master
1) Clicking any clock and going to the equinox page, you then click on
the equinox (5:05 EDT for my case - Ottawa)
2) Then go
Looking at our free windows programme - time zone master - it indicates
the autumn starts at 5:05 EDT
adding other clocks - Nairobi (and that whole timezone) turns out to
have the equinox at 12:05 EAT - (pretty close to noon)
its available from www.relativedata.com
I recently heard someone say The weather has been very odd recently,
and i certainly can't believe all this scientific bunk about global
climate change, but i have heard that the sun's azimuth is wrong, and if
thats the case it sounds pretty serious.
It amazing how a few people would rather
If there is a need for someone on the list to generate a programme for
astronomical positions in higher accuracy, I have already coded in C++,
a complete windows library that computes Galactic (GLat/GLng),
Ecliptical (Elat/ELng), Equatorial (Rta/Dec) and Horizontal (Alt/Azi)
positions of the
The suns position is specified as altitude and azimuth from the
observers position.
This can be computed from the Declination and Right Ascension of the sun
if you know the current local sidereal time and the latitude.
Then you have to adjust the altitude to compensate for the refraction of
not sure if it has a name, but they sure don't get much of a shadow at
noon on that day :)
On 2011-07-26 23:26, Brent wrote:
Hello again;
The equinoxes and solstices are special solar events for all of us.
The people who live in the tropics have another special event, when
the sun is
to suck its tides in and toss its tides out just
because of its shape!
David Patte
RelativeData.com
On 2011-07-03 20:55, Brent wrote:
Hello again;
I ask because there are a lot of very smart people on this list.
It seems odd to me that the moon just happens to be the right size
36 matches
Mail list logo
