saros unit
saros unit The term for the period of 18 years (inclusive of leap years) and 10.3 days in which the Earth, Moon, and Sun return to the same relative positions, so that solar and lunar eclipses repeat themselves. Thus the solar eclipse of 30 June 1973, was repeated on 11 July 1991. Each saros period contains about 43 solar and 28 lunar eclipses.
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saros unit