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FranklinSeiberling.com
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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:
 
Phase: 


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

 

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