Tetrad (astronomy)

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

1949-2000

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
1949-1950
Descending node   Ascending node
121 1949 Apr 13
Total
126 1949 Oct 07
Total
131 1950 Apr 02
Total
136 1950 Sep 26
Total
1967-1968
Descending node   Ascending node
121 1967 Apr 24
Total
126 1967 Oct 18
Total
131 1968 Apr 13
Total
136 1968 Oct 6
Total
1985-1986
Descending node   Ascending node
121 1985 May 04
Total
126 1985 Oct 28
Total
131 1986 Apr 24
Total
136 1986 Oct 17
Total

2001-2051

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
2003-2004
Descending node   Ascending node
121
2003 May 16
total
126
2003 Nov 09
total
131
2004 May 04
total
136
2004 Oct 28
total
2014-2015
Ascending node   Descending node
122
2014 Apr 15
Total
127
2014 Oct 08
Total
132
2015 Apr 04
Total
137
2015 Sep 28
Total
2032-2033
Ascending node   Descending node
122 2032 Apr 25
Total
127 2032 Oct 18
Total
132 2033 Apr 14
Total
137 2033 Oct 08
Total
2043-2044
Descending node   Ascending node
123 2043 Mar 25
Total
128 2043 Sep 19
Total
133 2044 Mar 13
Total
138 2044 Sep 07
Total
2050-2051
Ascending node   Descending node
122 2050 May 06
Total
127 2050 Oct 30
Total
132 2051 Apr 26
Total
137 2051 Oct 19
Total

See also

References

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