nouna cycle of about 18 years 11 days (6585.32 days) in which eclipses of the sun and moon occur in the same sequence and at the same intervals as in the previous such cycle
Word origin
C19: from Greek, from Babylonian
šāru 3600 (years); modern astronomical use apparently based on mistaken interpretationof
šāru as a period of 18
1⁄
2 years