The periodicity and recurrence of eclipses of the Sun by the Moon, and of the Moon by Earth, is described by the saros, which has a period of approximately 18 years.
Periodisasi dan rekurs gerhana matahari oleh Bulan, serta gerhana bulan oleh Bumi, bisa dijelaskan melalui teori saros, yang memiliki jangka waktu sekitar 18 tahun.