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What is a saros?

What is a saros? Here are some definitions.

Noun
  1. (historical, Babylon) A period of 3600 years.
  2. (astronomy) 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.
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Examples
The saros period also comprises 238.992 anomalistic months, again nearly a whole number.
Total solar eclipse tracks perform consistent geographical steps within a saros, as in Figure 2.2, and there are systematic trends in other eclipse sequences.
Thus, the Moon's distance from Earth is the same after a whole number of anomalistic months and very nearly the same after one saros.
He is against its being so far north as the Gulf of saros and the narrow neck of land there.
Two consecutive saros series are separated by the inex, a period of 29 years minus 20 days that is, 358 synodic months after which time the new moon has come from one node to the opposite node.
Referring to Figure 15-7 one sees how this eclipse echoes that of February 26, 1998, which was a saros earlier.

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