Tetrad (astronomy)
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In astronomy, a tetrad is a set of four total lunar eclipses within two consecutive years.[1]
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
[edit | edit source]1949–2000
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2001–51
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See also
[edit | edit source]- Total penumbral lunar eclipse § Summary frequency of total penumbral, total umbral and tetrad events 501–2500 for statistics by century
- Blood moon prophecy Apocalyptic preaching of John Hagee and Mark Biltz in part based on the observed phenomenon.
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