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There are three Things extreamly hard: Steel, a Diamond and to know one's self.
from Poor Richard's Almanack

Howell Street Almanac

Moon Phase Calculation
from US Naval Observatory


Moon Phase Calculation
by Sky & Telescope

Month: Day: Year:

Moon phase calculation algorithm by Roger W. Sinnott,
Sky & Telescope.
Calculations are based on UTC, not local time.


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