Ti kalendario a Gregoriano ket ti kalendario a maar-aramat iti agarup nga isuamin a lugar iti lubong.
Ti kalendario a Gregoriano ket ti nabalbaliwan a kalendario a Huliano. Immuna nga insingasing ni Aloysius Lilius, maysa a doktor a taga-Napoli, ken inyetnag ni Papa Gregorio XIII, a nakaipanagananna, idi Pebrero 24 1582.
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