Assertion: moon's phase | /r/HasProperty | calculated for any date
Facets:
value: by calculating the number of days
type: MANNER
Source sentences:
text: The approximate age of the Moon, and hence the approximate phase, can be calculated for any date by calculating the number of days since a known new moon (such as January 1, 1900 or August 11, 1999) and reducing this modulo 29.530588853 (the length of a synodic month).