Saros
Saros the eclipse cycle of about 18 years, almost the same length as 223 synodical months at the end of each saros the sun, moon, and line of nodes return to approximately the same relative positions, and another series of eclipses begins, closely resembling the series just
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
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