Tetrad (astronomy)

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
The frequency of tetrads varies by century with the frequency of total lunar eclipses.

In astronomy, a tetrad is a set of four total lunar eclipses within two years.[1]

List of tetrad events[edit]

1949–2000[edit]

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
1949–50
Descending node   Ascending node
121 1949 Apr 13
Lunar eclipse from moon-1949Apr13.png
Total
Lunar eclipse chart close-1949Apr13.png
126 1949 Oct 07
Lunar eclipse from moon-1949Oct07.png
Total
Lunar eclipse chart close-1949Oct07.png
131 1950 Apr 02
Lunar eclipse from moon-1950Apr02.png
Total
Lunar eclipse chart close-1950Apr02.png
136 1950 Sep 26
Lunar eclipse from moon-1950Sep26.png
Total
Lunar eclipse chart close-1950Sep26.png
1967–68
Descending node   Ascending node
121 1967 Apr 24
Lunar eclipse from moon-1967Apr24.png
Total
Lunar eclipse chart close-1967Apr24.png
126 1967 Oct 18
Lunar eclipse from moon-1967Oct18.png
Total
Lunar eclipse chart close-1967Oct18.png
131 1968 Apr 13
Lunar eclipse from moon-1968Apr13.png
Total
Lunar eclipse chart close-1968Apr13.png
136 1968 Oct 6
Lunar eclipse from moon-1968Oct06.png
Total
Lunar eclipse chart close-1968Oct06.png
1985–86
Descending node   Ascending node
121 1985 May 04
Lunar eclipse from moon-1985May04.png
Total
Lunar eclipse chart close-1985May04.png
126 1985 Oct 28
Lunar eclipse from moon-1985Oct28.png
Total
Lunar eclipse chart close-1985Oct28.png
131 1986 Apr 24
Lunar eclipse from moon-1986Apr24.png
Total
Lunar eclipse chart close-1986Apr24.png
136 1986 Oct 17
Lunar eclipse from moon-1986Oct17.png
Total
Lunar eclipse chart close-1986Oct17.png

2001–51[edit]

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
2003–04
Descending node   Ascending node
121
Lunar eclipse May 2003-TLR75.jpg
2003 May 16
Lunar eclipse from moon-2003May16.png
total
Lunar eclipse chart close-03may16.png
126
Lunar eclipse November 2003-TLR63.jpg
2003 Nov 09
Lunar eclipse from moon-2003Nov09.png
total
Lunar eclipse chart close-03nov09.png
131
Total lunar eclipse May 4 2004-Jpeter smith.jpg
2004 May 04
Lunar eclipse from moon-2004May04.png
total
Lunar eclipse chart close-04may04.png
136
Oct 28 2004 total lunar eclipse-espenak.png
2004 Oct 28
Lunar eclipse from moon-2004Oct28.png
total
Lunar eclipse chart close-04oct28.png
2014–15
Ascending node   Descending node
122
Lunar eclipse April 15 2014 California Alfredo Garcia Jr1.jpg
2014 Apr 15
Lunar eclipse from moon-2014Apr15.png
Total
Lunar eclipse chart close-2014Apr15.png
127
Lunar eclipse October 8 2014 California Alfredo Garcia Jr mideclipse.JPG
2014 Oct 08
Lunar eclipse from moon-2014Oct08.png
Total
Lunar eclipse chart close-2014Oct08.png
132
Lunar eclipse April 4 2015 greatest Alfredo Garcia Jr LA.jpg
2015 Apr 04
Lunar eclipse from moon-2015Apr04.png
Total
Lunar eclipse chart close-2015Apr04.png
137
Lunar eclipse September 27 2015 greatest Alfredo Garcia Jr.jpg
2015 Sep 28
Lunar eclipse from moon-2015Sep28.png
Total
Lunar eclipse chart close-2015Sep28.png
2032–33
Ascending node   Descending node
122 2032 Apr 25
Lunar eclipse from moon-2032Apr25.png
Total
Lunar eclipse chart close-2032Apr25.png
127 2032 Oct 18
Lunar eclipse from moon-2032Oct18.png
Total
Lunar eclipse chart close-2032Oct18.png
132 2033 Apr 14
Lunar eclipse from moon-2033Apr14.png
Total
Lunar eclipse chart close-2033Apr14.png
137 2033 Oct 08
Lunar eclipse from moon-2033Oct08.png
Total
Lunar eclipse chart close-2033Oct08.png
2043–44
Descending node   Ascending node
123 2043 Mar 25
Lunar eclipse from moon-2043Mar25.png
Total
Lunar eclipse chart close-2043Mar25.png
128 2043 Sep 19
Lunar eclipse from moon-2043Sep19.png
Total
Lunar eclipse chart close-2043Sep19.png
133 2044 Mar 13
Lunar eclipse from moon-2044Mar13.png
Total
Lunar eclipse chart close-2044Mar13.png
138 2044 Sep 07
Lunar eclipse from moon-2044Sep07.png
Total
Lunar eclipse chart close-2044Sep07.png
2050–51
Ascending node   Descending node
122 2050 May 06
Lunar eclipse from moon-2050May06.png
Total
Lunar eclipse chart close-2050May06.png
127 2050 Oct 30
Lunar eclipse from moon-2050Oct30.png
Total
Lunar eclipse chart close-2050Oct30.png
132 2051 Apr 26
Lunar eclipse from moon-2051Apr26.png
Total
Lunar eclipse chart close-2051Apr26.png
137 2051 Oct 19
Lunar eclipse from moon-2051Oct19.png
Total
Lunar eclipse chart close-2051Oct19.png

See also[edit]

References[edit]