Last Updated
：2025/11/20
Julian calendar
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The calendar which was used in the western world before the present-day Gregorian calendar. The Julian calendar differed in having all multiple-of-4 years as leap years.
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Julian calendar
Astronomers convert dates recorded under the Julian calendar into Gregorian dates to compare historical observations with modern records.
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Astronomers convert dates recorded under the Julian calendar into Gregorian dates to compare historical observations with modern records.
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