Algorithm for sunrise and sunset?

"Len Philpot" wrote in message
...
In article ,
says...
Hello all,

I'm sorry if this question is out of place here, but I have no idea
where to look.

I'm looking for a way to calculate the time of sunrise and sunset
given a UTC date & time and a set of coordinates.

I don't care about a specific programming language, as long as I can
figure out the formulae behind the thing.

Thanks in advance,
--
Martijn @ Coppoolse .com


At one point, there was such a file by s.a.a. contributor Paul Schlyter
in Bob Stout's C SNIPPETS (www.snippets.org), but I can't seem to
locate it anymore. If you can't locate it any other way, email me and I
send a copy I have to you, from an older version of SNIPPETS. It's
about 500 lines, or I'd just post it here.

Sky & Telescope published a BASIC language program for computing
times of sunrise and sunset. I believe that it was called
SUNUP.BAS, and should be available for download from the S&T
site:

http://skyandtelescope.com/resources...icle_326_1.asp

The program was from August 1994.

"Greg Neill" wrote...
"Len Philpot" wrote...
At one point, there was such a file by s.a.a. contributor Paul Schlyter
in Bob Stout's C SNIPPETS (www.snippets.org), but I can't seem to
locate it anymore. If you can't locate it any other way, email me and I
send a copy I have to you, from an older version of SNIPPETS. It's
about 500 lines, or I'd just post it here.

Sky & Telescope published a BASIC language program for computing
times of sunrise and sunset. I believe that it was called
SUNUP.BAS, and should be available for download from the S&T
site:

http://skyandtelescope.com/resources...icle_326_1.asp

The program was from August 1994.

Brilliant! Thanks a bunch for all those who replied.

I've got enough to go on with for now.

Thank you very much!
--
Martijn Coppoolse