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An eclipse in a semester sequence of solar eclipses repeats approximately every single 177 days and 4 hrs (a semester) at alternating nodes of the Moon's orbit. Littmann, Espenak, Willcox: Totality: Eclipses of the Sun. Jubier, Xavier Espenak, Fred. fifteen (4): 431-443. PMC 3898681. PMID 24459410.
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