eclipse year

eclipse year
   a unit of time used in astronomy in the prediction of eclipses. The plane of the moon's orbit around the earth and the plane of the earth's orbit around the sun intersect in a line called the line of nodes. Eclipses of the sun or moon can only occur at times when the moon and sun both lie very close to this line. However, the line of nodes rotates slowly, so comparable appearances of the sun on the line do not fall exactly a year apart. The actual interval between these crossings, the eclipse year, has a length of 346.62 days.

Dictionary of units of measurement. 2015.

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