April 1921 lunar eclipse
Encyclopedia
Lunar eclipse
A lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a...
took place on April 22, 1921. This was the first total lunar eclipse of Saros cycle 130.