Assertion: leap year | /r/HasProperty | introduced
Facets:
Source sentences:
text: Leap years were introduced because the calendar year was short, but they ended up making the average calendar year longer than the solar year.
text: Leap years were introduced because the calendar year was short, but they ended up making the average calendar year longer than the solar year.
text: Leap years were introduced because the calendar year was short, but they ended up making the average calendar year longer than the solar year.