Assertion: moon | /r/HasProperty | an error of one day
Facets:
Source sentences:
text: 8 years = 99 lunations (an Octaeteris) to within 1.5 days, i.e. an error of one day in 5 years; and
text: 11 years = 136 lunations within 1.5 days, i.e. an error of one day in 7.3 years.