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In Total Penumbral lunar eclipses, Jean Meeus, 1980
In astronomy
Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, g ...
, a tetrad is a set of four total lunar eclipses within two consecutive years.List of tetrad events
1949–2000
2001–51
See also
* for statistics by century *Dark tetrad
The dark triad is a psychological theory of personality, first published by Delroy L. Paulhus and Kevin M. Williams in 2002, that describes three notably offensive, but non-pathological personality types: Machiavellianism, sub-clinical narcissism, ...
Grouping of dark personality traits.
* Blood moon prophecy
The blood moon prophecies were a series of prophecies by Christian preachers John Hagee and Mark Biltz, related to a series of four full moons in 2014 and 2015. The prophecies stated that a tetrad (a series of four consecutive lunar eclipses—al ...
Apocalyptic preaching of John Hagee and Mark Biltz
Mark Biltz (born June 25, 1956) is an American Christian pastor and author. His theories correlate solar and lunar eclipses with biblical prophecy, and he has published several books on the topic. He is the Washington state director of Christians ...
in part based on the observed phenomenon.
References
{{Lunar eclipses Lunar eclipses