bn:01650973n
Noun Concept
Categories: Articles with short description, Specific calendars, Gregorian calendar
EN
proleptic Gregorian calendar  proleptic Gregorian
EN
The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. Wikipedia
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EN
The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. Wikipedia
Extension of the Gregorian calendar before its introduction Wikidata