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8 years, 4 months ago
Searching is easy to find terminator line (frontier between day and night) or the position of the sun in the sky given a position on the earth and a time; but I can't find how to obtain where is the zenith of the sun given a date (and time).
I need to obtain the center of the illuminated zone of the earth (latitude and longitude) at a given time. (Well, actually I need the opposite, the Nadir, but with one you can calculate easily the other).
Any knows the function?
Nov 11, 2014 at 8:55
Black Cid Black Cid
191 1 1 silver badge 3 3 bronze badges
What you're looking for is the latitude and longitude of the subsolar point.
Calculating it with accuracy is somewhat complicated. Here is a python library that has routines to do it for you:
You could also possibly query this information from other sites.
If you really want to work it out on your own, I suggest "Spherical Astronomy" by Robin M. Green published by Cambridge University Press as a starting point.
Jan 24, 2015 at 20:47
176 9 9 bronze badges
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