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April 1967 lunar eclipse

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April 1967 lunar eclipse
Total eclipse
A view of the eclipse as seen from the Moon, as observed by Surveyor 3.
DateApril 24, 1967
Gamma0.2972
Magnitude1.3356
Saros cycle121 (53 of 84)
Totality77 minutes, 56 seconds
Partiality202 minutes, 46 seconds
Penumbral313 minutes, 18 seconds
Contacts (UTC)
P19:29:48
U110:25:03
U211:27:28
Greatest12:06:26
U312:45:24
U413:47:49
P414:43:05

A total lunar eclipse occurred at the Moon’s descending node of orbit on Monday, April 24, 1967,[1] with an umbral magnitude of 1.3356. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring only about 16 hours after perigee (on April 23, 1967, at 20:00 UTC), the Moon's apparent diameter was larger.[2]

This lunar eclipse was the first of a tetrad, with four total lunar eclipses in series, the others being on October 18, 1967; April 13, 1968; and October 6, 1968.

The Surveyor 3 probe landed on the moon during this eclipse.[3]

Visibility

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The eclipse was completely visible over northeast Asia, Australia, and much of the Pacific Ocean, seen rising over most of Asia and setting over North America and western and central South America.[4]

Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[5]

April 24, 1967 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 2.28924
Umbral Magnitude 1.33559
Gamma 0.29722
Sun Right Ascension 02h05m32.6s
Sun Declination +12°43'38.7"
Sun Semi-Diameter 15'54.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 14h06m04.6s
Moon Declination -12°27'13.7"
Moon Semi-Diameter 16'40.5"
Moon Equatorial Horizontal Parallax 1°01'11.8"
ΔT 37.7 s

Eclipse season

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See also: Eclipse cycle

This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

Eclipse season of April–May 1967
April 24
Descending node (full moon)
 May 9
Ascending node (new moon)
Total lunar eclipse
Lunar Saros 121		 Partial solar eclipse
Solar Saros 147
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Eclipses in 1967

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Lunar Saros 121

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Inex

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Triad

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Lunar eclipses of 1966–1969

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Lunar eclipse series sets from 1966–1969
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
111 1966 May 4
 Penumbral
 1.05536 116 1966 Oct 29
 Penumbral
 −1.05999
121 1967 Apr 24
 Total
 0.29722 126 1967 Oct 18
 Total
 −0.36529
131 1968 Apr 13
 Total
 −0.41732 136 1968 Oct 6
 Total
 0.36054
141 1969 Apr 2
 Penumbral
 −1.17648 146 1969 Sep 25
 Penumbral
 1.06558
Last set 1965 Jun 14 Last set 1965 Dec 8
Next set 1970 Feb 21 Next set 1969 Aug 27

Metonic series

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This eclipse is the third of four Metonic cycle lunar eclipses on the same date, April 23–24, each separated by 19 years:

The Metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the Earth's shadow will in nearly the same location relative to the background stars.

Metonic lunar eclipse sets 1948–2005
Descending node   Ascending node
Saros Date Type Saros Date Type
111 1948 Apr 23 Partial 116 1948 Oct 18 Penumbral
121 1967 Apr 24 Total 126 1967 Oct 18 Total
131 1986 Apr 24 Total 136 1986 Oct 17 Total
141 2005 Apr 24 Penumbral 146 2005 Oct 17 Partial

Saros 121

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It was part of Saros series 121.

Tritos series

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The tritos series repeats 31 days short of 11 years at alternating nodes. Sequential events have incremental Saros cycle indices.

This series produces 20 total eclipses between April 24, 1967 and August 11, 2185, only being partial on November 19, 2021.

Tritos eclipse series (subset 1901–2087)
Descending node   Ascending node
Saros Date
Viewing 		Type
chart 		Saros Date
Viewing 		Type
chart
115 1901 Oct 27
 Partial
 116 1912 Sep 26
 Partial
117 1923 Aug 26
 Partial
 118 1934 Jul 26
 Partial
119 1945 Jun 25
 Partial
 120 1956 May 24
 Partial
121 1967 Apr 24
 Total
 122 1978 Mar 24
 Total
123 1989 Feb 20
 Total
 124 2000 Jan 21
 Total
125 2010 Dec 21
 Total
 126 2021 Nov 19
 Partial
127 2032 Oct 18
 Total
 128 2043 Sep 19
 Total
129 2054 Aug 18
 Total
 130 2065 Jul 17
 Total
131 2076 Jun 17
 Total
 132 2087 May 17
 Total
133 2098 Apr 15
 Total

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[6] This lunar eclipse is related to two annular solar eclipses of Solar Saros 128.

April 19, 1958 April 29, 1976

See also

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Notes

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  1. ^ "April 24, 1967 Total Lunar Eclipse (Blood Moon)". timeanddate. Retrieved 2 January 2025.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 2 January 2025.
  3. ^ A Solar Eclipse from the Moon APOD 2014 April 7
  4. ^ "Total Lunar Eclipse of 1967 Apr 24" (PDF). NASA. Retrieved 2 January 2025.
  5. ^ "Total Lunar Eclipse of 1967 Apr 24". EclipseWise.com. Retrieved 2 January 2025.
  6. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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