Tetrad

Short description: A set of four total lunar eclipses within two years

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]

## Contents

* 1 List of tetrad events
* 1.1 1949–2000
* 1.2 2001–51
* 2 See also
* 3 References

## List of tetrad events

### 1949–2000

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

### 2001–51

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 also

* 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.

## References

1. ↑ Total Penumbral lunar eclipses, Jean Meeus, 1980

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