Tetrad
Four consecutive Blood moons (Total Eclipses) without any other eclipses in between them. Neither total nor partial.
Three events in One Year.
In the period under review, there is only one year where three total lunar eclipses occurred in one year. That was in 1982.
Only at Full Moon
Total lunar eclipses happen only when:
- It is Full Moon.
- At the same time, the Moon is at (or very near) a lunar node, so the Sun, the Moon, and the Earth are aligned in a straight (or nearly straight) line.
Tetrads and Blood Moons
A series of four consecutive total lunar eclipses with no partial or penumbral lunar eclipses in between is called a lunar tetrad. In recent years, eclipses in a lunar tetrad have also been popularly called Blood Moons. This usage of the term has no technical or astronomical basis and it is thought that it has Biblical origins.
Below is the next Tetrads.
2032 to 2033
The previous Tetrad was 18 years before this one. (2014/15)
2043 to 2044
11 Years later.
Tetrads in the past.
1949 to 1950
1967 to 1968
1985 to 1986
2003 to 2004
2014 to 2015
2021 to 2022 (Partial) (Does not Qualify, as Nov 2021 was a partial Lunar Eclipse, very near Total.)
Therefore the last one was 2014/2015
Eclipse at its max for 28 Oct 2023 in South Africa
