saros series
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A saros series is a group of eclipses that repeat in the same pattern after a specific time interval called a saros period. This concept helps astronomers predict and track how eclipses will occur over long stretches of time.
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In astronomy, the saros (/ˈsɛərɒs/ ) is a length of time covering exactly 223 synodic months (18 years 11 days and 8 hours), nearly 242 draconic months, and nearly 239 anomalistic months. Arising naturally due to synchronization between lunar phase, nodal precession, and apsidal precession, it can be used to predict eclipses of the Sun and Moon. One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle. Every eclipse has an associated saros series and all succeeding or preceding eclipses have a different saros series associated with them - as the eclipse of the same series occurs or occurred with a gap of one saros only. Solar and lunar eclipses have different saros series.
A series of eclipses that are separated by one saros is called a saros series. It corresponds to: