July 1972 lunar eclipse
Template:Short description Template:Infobox lunar eclipse A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Wednesday, July 26, 1972,[1] with an umbral magnitude of 0.5427. 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 6.4 days after apogee (on July 19, 1972, at 21:20 UTC), the Moon's apparent diameter was smaller.[2]
Visibility
The eclipse was completely visible over much of North and South America and Antarctica, seen rising over Australia, northwestern North America]], and the central Pacific Ocean and setting over northeastern North America, west Africa, and the Atlantic Ocean.[3]
| File:Lunar eclipse from moon-1972Jul26.png File:Lunar eclipse chart close-1972Jul26.png |
Eclipse details
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 1.56180 |
| Umbral Magnitude | 0.54271 |
| Gamma | 0.71167 |
| Sun Right Ascension | 08h22m46.8s |
| Sun Declination | +19°24'04.5" |
| Sun Semi-Diameter | 15'44.9" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 20h21m51.2s |
| Moon Declination | -18°45'55.3" |
| Moon Semi-Diameter | 15'27.2" |
| Moon Equatorial Horizontal Parallax | 0°56'42.9" |
| ΔT | 42.8 s |
Eclipse season
Script error: No such module "Labelled list hatnote". 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.
| July 10 Descending node (new moon) |
July 26 Ascending node (full moon) |
|---|---|
| File:SE1972Jul10T.png | File:Lunar eclipse chart close-1972Jul26.png |
| Total solar eclipse Solar Saros 126 |
Partial lunar eclipse Lunar Saros 138 |
Related eclipses
Eclipses in 1972
- An annular solar eclipse on January 16.
- A total lunar eclipse on January 30.
- A total solar eclipse on July 10.
- A partial lunar eclipse on July 26.
Metonic
- Preceded by: Lunar eclipse of October 6, 1968
- Followed by: Lunar eclipse of May 13, 1976
Tzolkinex
- Preceded by: Lunar eclipse of June 14, 1965
- Followed by: Lunar eclipse of September 6, 1979
Half-Saros
- Preceded by: Solar eclipse of July 20, 1963
- Followed by: Solar eclipse of July 31, 1981
Tritos
- Preceded by: Lunar eclipse of August 26, 1961
- Followed by: Lunar eclipse of June 25, 1983
Lunar Saros 138
- Preceded by: Lunar eclipse of July 16, 1954
- Followed by: Lunar eclipse of August 6, 1990
Inex
- Preceded by: Lunar eclipse of August 15, 1943
- Followed by: Lunar eclipse of July 5, 2001
Triad
- Preceded by: Lunar eclipse of September 24, 1885
- Followed by: Lunar eclipse of May 27, 2059
Lunar eclipses of 1969–1973
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 2, 1969 and September 25, 1969 occur in the previous lunar year eclipse set, and the lunar eclipses on June 15, 1973 (penumbral) and December 10, 1973 (partial) occur in the next lunar year eclipse set.
Saros 138
This eclipse is a part of Saros series 138, repeating every 18 years, 11 days, and containing 82 events. The series started with a penumbral lunar eclipse on October 15, 1521. It contains partial eclipses from June 24, 1918 through August 28, 2026; total eclipses from September 7, 2044 through June 8, 2495; and a second set of partial eclipses from June 19, 2513 through August 13, 2603. The series ends at member 82 as a penumbral eclipse on March 30, 2982.
The longest duration of totality will be produced by member 48 at 105 minutes, 24 seconds on March 24, 2369. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on 2369 Mar 24, lasting 105 minutes, 24 seconds.[7] | Penumbral | Partial | Total | Central |
| 1521 Oct 15 |
1918 Jun 24 File:Lunar eclipse chart close-1918Jun24.png |
2044 Sep 07 File:Lunar eclipse chart close-2044Sep07.png |
2116 Oct 21 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2441 May 06 |
2495 Jun 08 |
2603 Aug 13 |
2982 Mar 30 | |
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
Template:Lunar Tritos series April 2005
Inex series
Template:Lunar Inex series July 2001
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 total solar eclipses of Solar Saros 145.
| July 20, 1963 | July 31, 1981 |
|---|---|
| File:SE1963Jul20T.png | File:SE1981Jul31T.png |
See also
Notes
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- ↑ Listing of Eclipses of series 138
- ↑ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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External links
- 1972 Jul 26 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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