Dustin's Channel: https://www.youtube.com/watch?v=PL4EcvTboYE&t=6s
https://www.youtube.com/channel/UCDD0FIvHF4REUS1ra7YHyDA
Amplitudes use Bowditch tables or math formulae to calculate the season/declination corrected position of sunset or sunrise to help you determine compass error at sea.