Sun Rise/set times --- Algo to compute

David Sieber

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Feb 9, 1996, 3:00:00 AM2/9/96

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I know this subject is not GPS, but the group's traffic indicates
one/many of you might know.

I there an algorithmic approach that can be used to determine (+/- a few min)
the Sun Rise and Set time for a given day and geographic position.

David Sieber

Ejo Schrama

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Feb 10, 1996, 3:00:00 AM2/10/96

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See my homepage
--
Ejo Schrama, http://www.geo.tudelft.nl/fmr/people/schrama.html

Mr. Brooke Clarke

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Feb 11, 1996, 3:00:00 AM2/11/96

to David Sieber

David Sieber wrote:

>
> I there an algorithmic approach that can be used to determine (+/- a few min) the Sun Rise and Set time for a given day and geographic
position.
>
> David Sieber

Yes. The best book I have found is "SUNDIALS Their Theory and
Construction" by Albert E. Waugh. ISBN 0-486-22947-5. Your local
Library may have it or another book on "dialing".

I tought a senior high class how to make a noon mark that tells 12:00
noon PDT or PST (automatically depending on the time of year) to within
about 15 seconds of time. It turned out to be more accurate than the
time set into the quartz watches of most of the class.

Have Fun,
Brooke

Charles Vollum

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Feb 13, 1996, 3:00:00 AM2/13/96

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In article <19960209....@lfs.loral.com>, sie...@lfs.loral.com
(David Sieber) wrote:

> I know this subject is not GPS, but the group's traffic indicates
> one/many of you might know.
>

> I there an algorithmic approach that can be used to determine (+/- a few min)
> the Sun Rise and Set time for a given day and geographic position.
>
> David Sieber

Take a look at the sci.astro FAQ. It explains how, and gives references.

Charles

Peter Smith

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Feb 14, 1996, 3:00:00 AM2/14/96

to

David Sieber (sie...@lfs.loral.com) spake thusly:
: Is there an algorithmic approach that can be used to determine (+/- a few min)

: the Sun Rise and Set time for a given day and geographic position.

If you want the sources for a working program, Newbury's "srss" and Elwood
Downey's "ephem" can both be found at various archives. Both can be run
under Unix or DOS. If you want some theory and algorithms so you can try
you hand at your own program, Jan Meeus's _Astronomical Algorithms_ and
Peter Duffet-Smith's _Practical Astronomy With Your Personal Computer_ are
good places to start.

--
Peter Smith -- psm...@wellspring.us.dg.com
Data General Corp., Westboro, Massachusetts (for whom I do not speak)

Bill Gronos

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Feb 15, 1996, 3:00:00 AM2/15/96

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-> under Unix or DOS. If you want some theory and algorithms so you
-> can try you hand at your own program, Jan Meeus's _Astronomical
-> Algorithms_ and Peter Duffet-Smith's _Practical Astronomy With Your
-> Personal Computer_ are good places to start.

Do u have any recommendations for books dealing with terrestial
calculations? I searched in vain (and I fancy myself a fairly decent
researcher) for books describing lat/long-distance and UTM-L/L
conversions.

Bob Baggerman

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Feb 20, 1996, 3:00:00 AM2/20/96

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Bill Gronos wrote:
>Do u have any recommendations for books dealing with terrestial
>calculations? I searched in vain (and I fancy myself a fairly decent
>researcher) for books describing lat/long-distance and UTM-L/L
>conversions.

I've been using "Spherical Trigonometry with Naval and Military
Applications"; Kells, Kern, and Bland; McGraw-Hill; 1942. It's
a classic.

Bob

--
Bob Baggerman ! bob.ba...@gtri.gatech.edu
Electronic Systems Laboratory ! 404-894-7109 (office)
Georgia Tech Research Institute ! 404-894-7080 (FAX)
Atlanta, GA 30332 USA !