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The Gregorian Calendar

Pope Gregory XIII began the modern calendar 400 years ago in order to correct the accumulating drift in the Julian calendar and keep Easter in the spring

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Scientific American Magazine Vol 246 Issue 5This article was originally published with the title “The Gregorian Calendar” in Scientific American Magazine Vol. 246 No. 5 (), p. 144
doi:10.1038/scientificamerican0582-144