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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 consecutive years.[1]

List of tetrad eventsEdit

1949–2000Edit

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
1949–50
Descending node   Ascending node
121 1949 Apr 13
 
Total
 
126 1949 Oct 07
 
Total
 
131 1950 Apr 02
 
Total
 
136 1950 Sep 26
 
Total
 
1967–68
Descending node   Ascending node
121 1967 Apr 24
 
Total
 
126 1967 Oct 18
 
Total
 
131 1968 Apr 13
 
Total
 
136 1968 Oct 6
 
Total
 
1985–86
Descending node   Ascending node
121 1985 May 04
 
Total
 
126 1985 Oct 28
 
Total
 
131 1986 Apr 24
 
Total
 
136 1986 Oct 17
 
Total
 

2001–51Edit

Saros Date
Viewing
Type
Chart
Saros Date
Viewing
Type
Chart
2003–04
Descending node   Ascending node
121
 
2003 May 16
 
total
 
126
 
2003 Nov 09
 
total
 
131
 
2004 May 04
 
total
 
136
 
2004 Oct 28
 
total
 
2014–15
Ascending node   Descending node
122
 
2014 Apr 15
 
Total
 
127
 
2014 Oct 08
 
Total
 
132
 
2015 Apr 04
 
Total
 
137
 
2015 Sep 28
 
Total
 
2032–33
Ascending node   Descending node
122 2032 Apr 25
 
Total
 
127 2032 Oct 18
 
Total
 
132 2033 Apr 14
 
Total
 
137 2033 Oct 08
 
Total
 
2043–44
Descending node   Ascending node
123 2043 Mar 25
 
Total
 
128 2043 Sep 19
 
Total
 
133 2044 Mar 13
 
Total
 
138 2044 Sep 07
 
Total
 
2050–51
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 alsoEdit

ReferencesEdit