交点年(英文:draconic year),又称食年(英文:eclipse year),是太阳沿着黄道连续两次经过同一黄白交点(升交点)所需时间,其长度为346.6200日。

由于黄白交点每年西移20°,因此,交点年相应地比恒星年短。

Wikiwand in your browser!

Seamless Wikipedia browsing. On steroids.

Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.

Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.