I saw this code online where a guy calculates the separation between sun and moon and verify the occurrence of eclipses. You can find the codes here.
Why does he uses earth's angular size seen from the moon in this calculation ?
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observer.elevation = -6371000), he needs to compute if there's anywhere on the surface of the Earth, even if there isn't one at the center of the Earth. $\endgroup$ – barrycarter Dec 26 '18 at 20:35