saros.
A quantity of 3600, such as a period of 3600 years.
Meaning & usage
A quantity of 3600, such as a period of 3600 years.
A period of 223 synodic months (approximately 18 years 11 days 8 hours), after which the relative positions of the earth, sun and moon recur, used to predict eclipses.
Where this word comes from
From Ancient Greek σάρος (sáros), from Akkadian 𒊹 (šar₂ /šār/, “3600, total, many, a great quantity or measure”). The modern astronomical usage is attributed to Edmond Halley, who based it on the word σάρος (sáros), defined in the Suda as "a measure and a number among Chaldeans. For 120 saroi make 2222 years according to the Chaldeans' reckoning, if indeed the saros makes 222 lunar months, which are 18 years and 6 months."
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.