I am writing a program that requires calculations of civil twilight timings. I know how to calculate sunrise and sunset timings(actually I just searched online for a formula and copied it into my code blindly), but I can't find any resources on twilight timings. Everything I know about this is that when the sun elevation is from 0 to -6 degrees, it's civil twilight.
2026-03-25 11:05:13.1774436713
How to calculate civil twilight timings?
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As per as my knowledge, for Hour angle calculation you are using Zenith distance as 90.833 degrees, just replace 90.833 with 96 degrees(Civil twilight), 102 (Nautical) and 108 (astronomical)