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Re: Easter
Vernal equinox is easy to calculate given some basic calculus and trig. Any astronomer can give you the exact day.
Full moon is also easy to calculate because you're looking for a position where the sun's light reflects the entire of the moon. Also easy for an astronomer to get. In older days though, they probably used the temples and calendars. With some basic math, you can calculate the rotation rate of the moon around the earth, and from there you can calculate the number of days between full moon and full moon, as well as work in where the new moon fits in. Then you can calculate the exact day of the full moon.
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