Related terms:
ides
bis
kalender
kalendar
leap years
leap year
divisible
calendario
julian year
intercalary month
vernal equinox
julian
revised julian calendar
julian calendar
calendar
gregorian calendar
adopted the gregorian calendar
month
orthodox church
february
Wikipedia sources:
Leap year
Gregorian calendar
Julian calendar
February 29
February 30
French Republican Calendar
Context for words:
leap
day
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