Metonic Series
This eclipse is the third of four Metonic cycle lunar eclipses on the same date, May 15-16, each separated by 19 years.
The moon's path through the Earth's shadow near its descending node progresses southward through each sequential eclipse. The second and third are total eclipses.
The Metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the earth's shadow will be in nearly the same location relative to the background stars.
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Read more about this topic: May 2022 Lunar Eclipse, Related Eclipses
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