Assertion: leap year's day | /r/Synonym | year day
Facets:
Source sentences:
text: This extra day, which falls on February 29 and is called Leap Day or Leap Year Day, exists to keep the calendar year in synchrony with the astronomical year, or the time it takes Earth to make a full rotation around the sun.
text: The odd day in leap years was placed between Old and New Year's Days, and called Leap Year Day.