Answer:
A lunar eclipse occurs when the Moon moves into the Earth's shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth between the other two, and only on the night of a full moon. ... For the date of the next eclipse, see § Recent and forthcoming lunar eclipses
How often does a lunar eclipse happen?
every 2.5 years
How Often Do They Happen? About 35% of all lunar eclipses in a calendar year are total lunar eclipses. On average, a total lunar eclipse can be seen from any given location every 2.5 years.
A totally eclipsed Moon is sometimes called a blood moon for its reddish color, which is caused by Earth completely blocking direct sunlight from reaching the Moon. The only light reflected from the lunar surface has been refracted by Earth's atmosphere. This light appears reddish for the same reason that a sunset or sunrise does: the Rayleigh scattering of bluer light.
Explanation:
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