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September 1979 lunar eclipse

September 1979 lunar eclipse
Total eclipse
The Moon's hourly motion shown right to left
DateSeptember 6, 1979
Gamma−0.4305
Magnitude1.0936
Saros cycle137 (26 of 81)
Totality44 minutes, 25 seconds
Partiality191 minutes, 52 seconds
Penumbral305 minutes, 9 seconds
Contacts (UTC)
P18:21:37
U19:18:15
U210:31:59
Greatest10:54:12
U311:16:24
U412:30:08
P413:26:45

A total lunar eclipse occurred at the Moon’s descending node of orbit on Thursday, September 6, 1979,[1] with an umbral magnitude of 1.0936. 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 5 hours after perigee (on September 6, 1979, at 6:00 UTC), the Moon's apparent diameter was larger.[2]

Visibility

The eclipse was completely visible over eastern Australia, western North America, and the central and eastern Pacific Ocean, seen rising over the eastern half of Asia and western Australia and setting over North and South America.[3]

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

September 6, 1979 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 2.04211
Umbral Magnitude 1.09358
Gamma −0.43050
Sun Right Ascension 10h58m17.1s
Sun Declination +06°34'46.5"
Sun Semi-Diameter 15'52.1"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 22h58m48.1s
Moon Declination -07°00'03.6"
Moon Semi-Diameter 16'43.7"
Moon Equatorial Horizontal Parallax 1°01'23.8"
ΔT 50.2 s

Eclipse season

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 August–September 1979
August 22
Ascending node (new moon)
 September 6
Descending node (full moon)
Annular solar eclipse
Solar Saros 125		 Total lunar eclipse
Lunar Saros 137

Eclipses in 1979

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 137

Inex

Triad

Lunar eclipses of 1977–1980

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 eclipse on July 27, 1980 occurs in the next lunar year eclipse set.

Lunar eclipse series sets from 1977 to 1980
Ascending node   Descending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
112 1977 Apr 04
 Partial
 −0.9148 117 1977 Sep 27
 Penumbral
 1.0768
122 1978 Mar 24
 Total
 −0.2140 127 1978 Sep 16
 Total
 0.2951
132 1979 Mar 13
 Partial
 0.5254 137 1979 Sep 06
 Total
 −0.4305
142 1980 Mar 01
 Penumbral
 1.2270 147 1980 Aug 26
 Penumbral
 −1.1608

Saros 137

This eclipse is a part of Saros series 137, repeating every 18 years, 11 days, and containing 78 events. The series started with a penumbral lunar eclipse on December 17, 1564. It contains partial eclipses from June 10, 1835 through August 26, 1961; total eclipses from September 6, 1979 through June 28, 2466; and a second set of partial eclipses from July 9, 2484 through September 12, 2592. The series ends at member 78 as a penumbral eclipse on April 20, 2953.

The longest duration of totality will be produced by member 44 at 99 minutes, 53 seconds on April 13, 2340. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Greatest First
The greatest eclipse of the series will occur on 2340 Apr 13, lasting 99 minutes, 53 seconds.[7] Penumbral Partial Total Central
1564 Dec 17
 1835 Jun 10
 1979 Sep 06
 2051 Oct 19
Last
Central Total Partial Penumbral
2412 May 26
 2466 Jun 28
 2592 Sep 12
 2953 Apr 20

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

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 2187
1805 Jan 15
(Saros 121) 		1815 Dec 16
(Saros 122) 		1826 Nov 14
(Saros 123) 		1837 Oct 13
(Saros 124) 		1848 Sep 13
(Saros 125)
1859 Aug 13
(Saros 126) 		1870 Jul 12
(Saros 127) 		1881 Jun 12
(Saros 128) 		1892 May 11
(Saros 129) 		1903 Apr 12
(Saros 130)
1914 Mar 12
(Saros 131) 		1925 Feb 08
(Saros 132) 		1936 Jan 08
(Saros 133) 		1946 Dec 08
(Saros 134) 		1957 Nov 07
(Saros 135)
1968 Oct 06
(Saros 136) 		1979 Sep 06
(Saros 137) 		1990 Aug 06
(Saros 138) 		2001 Jul 05
(Saros 139) 		2012 Jun 04
(Saros 140)
2023 May 05
(Saros 141) 		2034 Apr 03
(Saros 142) 		2045 Mar 03
(Saros 143) 		2056 Feb 01
(Saros 144) 		2066 Dec 31
(Saros 145)
2077 Nov 29
(Saros 146) 		2088 Oct 30
(Saros 147) 		2099 Sep 29
(Saros 148) 		2110 Aug 29
(Saros 149) 		2121 Jul 30
(Saros 150)
2132 Jun 28
(Saros 151) 		2143 May 28
(Saros 152) 		2154 Apr 28
(Saros 153)
2187 Jan 24
(Saros 156)

Half-Saros cycle

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 annular solar eclipses of Solar Saros 144.

August 31, 1970 September 11, 1988

See also

Notes

  1. ^ "September 5–6, 1979 Total Lunar Eclipse (Blood Moon)". timeanddate. Retrieved 4 January 2025.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 4 January 2025.
  3. ^ "Total Lunar Eclipse of 1979 Sep 06" (PDF). NASA. Retrieved 4 January 2025.
  4. ^ "Total Lunar Eclipse of 1979 Sep 06". EclipseWise.com. Retrieved 4 January 2025.
  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 137". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 137
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros


Quelle: https://en.wikipedia.org/wiki/September_1979_lunar_eclipse