交点年

Multi tool use
交點年(英文:draconic year),又稱食年(英文:eclipse year),是太陽沿黃道連續兩次經過同一黃白交點(升交點)所需時間,其長度為346.6200日。
由於黃白交點每年西移20°,因此,交點年相應地比恆星年短。
时间
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基本概念 |
历史 · 過去 · 現在 · 未来 · 永恆 · 时间箭头
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時間單位 |
取法自然:銀河年 · 默冬章 · 年 · 季 · 月 · 日 人為單位:秒 · 分 · 刻 · 时 · 周 · 旬 · 年代 · 世纪 · 千纪 中國古代曆法時間單位:元 · 紀 · 蔀 · 章 · 歲 · 月 · 旬 · 日 · 辰 · 更 · 點 · 刻 印度古代時間單位:大時 · 須臾 · 羅豫 · 腊缚 · 彈指 · 坦剎那 · 瞬頃 · 念 · 剎那 · 生滅 取自物理理論:普朗克時間
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天文的年 |
交点年 · 回归年 · 恒星年 · 近点年 · 儒略年
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天文的月 |
交點月 · 回歸月 · 恒星月 · 近點月 · 朔望月
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天文的日 |
太阳日 · 恒星日 · 曆書日 · 儒略日 · 朔望日
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天文的時 |
民用時 · 恆星時 · 曆書時
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時間標準 |
原子时 · 協調世界時(UTC) · 格林尼治平时(GMT) · 地球時(TT) · 力學時(DT)
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授時與守時 |
授時:原時 · 曆元 · 岁差 · 均時差 · 偕日升 守時:地方平時 · 时区 · 標準時間
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其他 |
時鐘 · 分點 · 時間地理學 · 時間生物學 · 未来学 · 時空 · 時間旅行 · UNIX时间
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参见:數量級 (時間) · 地質年代 · 年代學
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