グレゴリオ暦
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<timefyi-glossary slug="gregorian-calendar"></timefyi-glossary>定義
1582年にローマ教皇グレゴリウス13世が導入した太陽暦で、現在の国際民間標準。うるう年ルールを改良することでユリウス暦のずれを修正した。