Tetrad (astronomy)
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In astronomy, a tetrad is a set of four total lunar eclipses within two consecutive years.
Lunar eclipse May 2003 TLR75
Lunar eclipse November 2003 TLR63
Lunar eclipse April 15 2014 California Alfredo Garcia Jr 1
Lunar eclipse October 8 2014 California Alfredo Garcia Jr mideclipse
A total penumbral lunar eclipse is a lunar eclipse that occurs when the Moon becomes completely immersed in the penumbral cone of the Earth without touching the umbra.
Tetrad (astronomy)
…tetrads varies by century with the frequency of total lunar eclipses. This repeating cycle is called a tetradia. See Eclipse cycle for more information. 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…
Lunar eclipse of 2017 August 7 Kuwait
Full Eclipse of the Moon as seen in from Irvine, CA, USA
Penumbral lunar eclipse 2017.02.11
Full Moon 2010