Le Marteau's Journal: Programming Q: function that can return "day" or "night" depending on lat/long?

Does anyone know where I can find some code (preferably, in Perl, Java or Javascript) that can return, for a passed latitude/longitude, whether it is daylight or nighttime?

not sure

[stoolpigeon]

this site seems to be able to get you where you want to go - they say it's done with javascript, which means you should be able to look at their code. http://www.csgnetwork.com/sunriseset.html [csgnetwork.com]

Not Javascript

[LordBodak]

There's an Arduino library called Time Lord [swfltek.com] that will calculate sunrise and sunset times with a given lat/long. It's C++ but it looks like it wouldn't be too hard to convert just that calculation.

Re:

[Le Marteau]

Thanks, Gents...

stoolpigeon's recommendation works, but it was copyrighted (which I didn't say was an issue, but it is). Translating from C++ was option "B" on a number of fronts.

But I did find a Perl package which works beautifully and is free: Astro-satpass [cpan.org] which can give the position of the sun, moon, planets, and even satellites, based on time, latitude, longitude and elevation.

Re:

[Le Marteau]

Hmmm... link does not work. Anyway, it's findable at cpan.org, search for "Astro-Satpass"

And it gives star positions, too.