This is a rare celestial event in which the Moon passes through the shadow of the Earth, blocking out the Sun's light and casting a reddish hue on the Moon. During a Total Lunar Eclipse, the Moon is completely covered by the Earth's shadow and can be seen from most parts of
From Wikipedia
A lunar eclipse, also called a blood moon, is an astronomical event that occurs when the Moon orbits through Earth's shadow. Lunar eclipses occur during eclipse season, when the Moon's orbital plane is approximately in line with Earth and the Sun. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node.