Eclipses may occur repeatedly, separated by certain intervals of time: these intervals are called eclipse cycles. The tritos is an eclipse cycle of 3,986.628 days (about 10 years, 11 months). The length of the tritos is equal to the length of the inex minus the length of the saros eclipse cycles. Therefore, eclipses that occur 1 tritos apart (i.e. both eclipses belong to the same tritos series), belong to two different saros series with series numbers that differ by one.
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