"The average duration of the eclipse year is 346.62 days. This term is sometimes erroneously used for the draconic or nodal period of lunar precession, that is the period of a complete revolution of the Moon's ascending node around the ecliptic: 18.6128 Julian years (6798.331019 days)"

tweakktweakk のブックマーク 2012/01/12 11:41

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Year - Wikipedia

    An animation of the inner Solar System planets' orbit around the Sun. The duration of the year is the time taken to go around the Sun. A year is the time taken for astronomical objects to complete ...

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