Assertion: calendar's day | /r/HasProperty | extra
Facets:
Source sentences:
text: The International Fixed Calendar inserts the extra day in leap years as June 29 - between Saturday June 28 and Sunday Sol 1.
text: It utilizes a 365-day, 12 month model and adds an extra day in February every 4 years.
text: The lunar calendar, which fits days into the cycle of lunar months, adding an extra day when needed, while ignoring the annual solar cycle of the seasons.
text: The solar calendar, which fits artificial months into the year, adding an extra day into one month when needed, while ignoring the lunar cycle of new/full moons.