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September 1941 lunar eclipse

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September 1941 lunar eclipse
Partial eclipse
The Moon's hourly motion shown right to left
DateSeptember 5, 1941
Gamma0.9747
Magnitude0.0511
Saros cycle117 (48 of 72)
Partiality53 minutes, 21 seconds
Penumbral279 minutes, 17 seconds
Contacts (UTC)
P115:27:10
U117:20:03
Greatest17:46:50
U418:13:24
P420:06:27

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Friday, September 5, 1941,[1] with an umbral magnitude of 0.0511. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in the Earth's penumbra. 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. Occurring about 5.9 days before apogee (on September 11, 1941, at 14:15 UTC), the Moon's apparent diameter was smaller.[2]

Visibility

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The eclipse was completely visible over much of Asia, Australia, and Antarctica, seen rising over Africa and Europe and setting over northeast Asia and the central Pacific Ocean.[3]

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.[4]

September 5, 1941 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.08839
Umbral Magnitude 0.05110
Gamma 0.97469
Sun Right Ascension 10h56m24.2s
Sun Declination +06°46'29.9"
Sun Semi-Diameter 15'52.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 22h55m20.3s
Moon Declination -05°54'07.9"
Moon Semi-Diameter 15'17.9"
Moon Equatorial Horizontal Parallax 0°56'08.6"
ΔT 25.2 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 September 1941
September 5
Descending node (full moon)		 September 21
Ascending node (new moon)
Partial lunar eclipse
Lunar Saros 117		 Total solar eclipse
Solar Saros 143
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Eclipses in 1941

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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 117

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Inex

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Triad

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Lunar eclipses of 1940–1944

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This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The penumbral lunar eclipses on April 22, 1940 and October 16, 1940 occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on July 6, 1944 and December 29, 1944 occur in the next lunar year eclipse set.

Lunar eclipse series sets from 1940 to 1944
Ascending node   Descending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
102 1940 Mar 23
 Penumbral
 −1.5034 107
112 1941 Mar 13
 Partial
 −0.8437 117 1941 Sep 05
 Partial
 0.9747
122 1942 Mar 03
 Total
 −0.1545 127 1942 Aug 26
 Total
 0.1818
132 1943 Feb 20
 Partial
 0.5752 137 1943 Aug 15
 Partial
 −0.5534
142 1944 Feb 09
 Penumbral
 1.2698 147 1944 Aug 04
 Penumbral
 −1.2843

Saros 117

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This eclipse is a part of Saros series 117, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on April 3, 1094. It contains partial eclipses from June 29, 1238 through September 23, 1382; total eclipses from October 3, 1400 through June 21, 1815; and a second set of partial eclipses from July 2, 1833 through September 5, 1941. The series ends at member 71 as a penumbral eclipse on May 15, 2356.

The longest duration of totality was produced by member 35 at 105 minutes, 43 seconds on April 17, 1707. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Greatest First
The greatest eclipse of the series occurred on 1707 Apr 17, lasting 105 minutes, 43 seconds.[7] Penumbral Partial Total Central
1094 Apr 03
 1238 Jun 29
 1400 Oct 03
 1563 Jan 09
Last
Central Total Partial Penumbral
1761 May 18
 1815 Jun 21
 1941 Sep 05
 2356 May 15

Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

Tritos series

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This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200
1810 Sep 13
(Saros 105) 		1821 Aug 13
(Saros 106) 		1832 Jul 12
(Saros 107) 		1843 Jun 12
(Saros 108) 		1854 May 12
(Saros 109)
1865 Apr 11
(Saros 110) 		1876 Mar 10
(Saros 111) 		1887 Feb 08
(Saros 112) 		1898 Jan 08
(Saros 113) 		1908 Dec 07
(Saros 114)
1919 Nov 07
(Saros 115) 		1930 Oct 07
(Saros 116) 		1941 Sep 05
(Saros 117) 		1952 Aug 05
(Saros 118) 		1963 Jul 06
(Saros 119)
1974 Jun 04
(Saros 120) 		1985 May 04
(Saros 121) 		1996 Apr 04
(Saros 122) 		2007 Mar 03
(Saros 123) 		2018 Jan 31
(Saros 124)
2028 Dec 31
(Saros 125) 		2039 Nov 30
(Saros 126) 		2050 Oct 30
(Saros 127) 		2061 Sep 29
(Saros 128) 		2072 Aug 28
(Saros 129)
2083 Jul 29
(Saros 130) 		2094 Jun 28
(Saros 131) 		2105 May 28
(Saros 132) 		2116 Apr 27
(Saros 133) 		2127 Mar 28
(Saros 134)
2138 Feb 24
(Saros 135) 		2149 Jan 23
(Saros 136) 		2159 Dec 24
(Saros 137) 		2170 Nov 23
(Saros 138) 		2181 Oct 22
(Saros 139)
2192 Sep 21
(Saros 140)

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).[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 124.

August 31, 1932 September 12, 1950

See also

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References

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  1. ^ "September 5–6, 1941 Partial Lunar Eclipse". timeanddate. Retrieved 19 December 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 19 December 2024.
  3. ^ "Partial Lunar Eclipse of 1941 Sep 05" (PDF). NASA. Retrieved 19 December 2024.
  4. ^ "Partial Lunar Eclipse of 1941 Sep 05". EclipseWise.com. Retrieved 19 December 2024.
  5. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  6. ^ "NASA - Catalog of Lunar Eclipses of Saros 117". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 117
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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