Assertion: leap year's day | /r/HasProperty | only 23 hours
Facets:
Source sentences:
text: Once you add up all of the calendar year's 24 hour days (which do not even accurately represent one revolution of the Earth, since that - the "sidereal day" - is only 23 hours, 56 minutes and 4 seconds long), you're left with that extra 5+ hours of time.