Assertion: moon's phase | /r/CapableOf | fall in periods of 19 years
Facets:
value: per earthsky
type: OTHER
value: the same calendar dates
type: TEMPORAL
Source sentences:
text: Per EarthSky, "in periods of 19 years, the phases of the moon fall on or near the same calendar dates because 19 calendar years are nearly commensurate with 235 lunar months," or 235 lunar cycles that ultimately return to full moons.