Tetrad (astronomy)

In astronomy, a tetrad is a set of four total lunar eclipses within two consecutive years.

The frequency of tetrads varies by century with the frequency of total lunar eclipses. This repeating cycle is called a tetradia. See Eclipse cycle for more information.

List of tetrad events

1949–2000

2001–51

See also

• for statistics by century
• Blood moon prophecy Apocalyptic preaching of John Hagee and Mark Biltz in part based on the observed phenomenon.

References