先発グレゴリオ暦
calendarEmbed This Widget
Add the script tag and a data attribute to embed this widget.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<div data-timefyi="glossary" data-slug="proleptic-gregorian-calendar"></div>Embed via iframe for maximum compatibility.
<iframe src="https://timefyi.com/iframe/glossary/proleptic-gregorian-calendar/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://timefyi.com/glossary/proleptic-gregorian-calendar/Add a dynamic SVG badge to your README or docs.
[](https://timefyi.com/glossary/proleptic-gregorian-calendar/)Use the native HTML custom element.
<script src="https://cdn.jsdelivr.net/npm/timefyi-embed@1/dist/embed.min.js" defer></script>
<timefyi-glossary slug="proleptic-gregorian-calendar"></timefyi-glossary>定義
グレゴリオ暦が1582年に正式に導入される以前の日付にまで延長した暦。歴史的・天文学的計算で使用され、ギャップを避ける。ISO 8601は先発グレゴリオ暦を使用する。