轴的岁差（分点岁差）
astronomyEmbed 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="precession"></div>Embed via iframe for maximum compatibility.
<iframe src="https://timefyi.com/iframe/glossary/precession/" 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/precession/Add a dynamic SVG badge to your README or docs.
[](https://timefyi.com/glossary/precession/)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="precession"></timefyi-glossary>定义
地球自转轴缓慢的陀螺式摆动，完成一个完整周期约需25,772年（柏拉图年）。岁差导致春分点在数千年内缓慢移过黄道十二宫。