Assertion: leap year's day | /r/AtLocation | the year
Facets:
value: to synchronize the calendar year
type: PURPOSE
value: usually
type: TEMPORAL
Source sentences:
text: The extra day is usually added to the year every four years.
text: The extra day (February 29) is added to years where:
text: In fact, the extra day is added to every year that can be evenly divided by the number four unless that year can also be evenly divided by 100, in which case it is only a leap year if it can also be evenly divided by 400.
text: This extra day is added to the year to synchronize the calendar year with the solar year.