The April 8 eclipse is part of Saros 139. What does that mea

The April 8 eclipse is part of Saros 139. What does that mean?

The April 8 eclipse is part of Saros 139. What does that mean?
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Fred Espenak Eclipsewise , Deborah Byrd , , Saros Cycle , North Pole , Any Saros , Solar Saros , Tzolkinex Cycle , Tritos Cycle , United States , Guy Ottowell , Astronomy Essentials , Human World ,