April 1948 lunar eclipse
| Partial eclipse | |||||||||||||
 The Moon's hourly motion shown right to left | |||||||||||||
| Date | April 23, 1948 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gamma | 1.0017 | ||||||||||||
| Magnitude | 0.0230 | ||||||||||||
| Saros cycle | 111 (63 of 71) | ||||||||||||
| Partiality | 34 minutes, 21 seconds | ||||||||||||
| Penumbral | 257 minutes, 35 seconds | ||||||||||||
| |||||||||||||
A partial lunar eclipse occurred at the Moon’s descending node of orbit on Friday, April 23, 1948,[1] with an umbral magnitude of 0.0230. 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 3.5 days after perigee (on April 20, 1948, at 2:05 UTC), the Moon's apparent diameter was larger.[2]
Visibility
[edit]The eclipse was completely visible over east and northeast Asia, Australia, and Antarctica, seen rising over east Africa and the western half of Asia and setting over western North America and the eastern Pacific Ocean.[3]
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Eclipse details
[edit]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 | 1.01720 |
| Umbral Magnitude | 0.02300 |
| Gamma | 1.00165 |
| Sun Right Ascension | 02h04m17.6s |
| Sun Declination | +12°37'06.8" |
| Sun Semi-Diameter | 15'54.1" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 14h06m01.0s |
| Moon Declination | -11°44'01.4" |
| Moon Semi-Diameter | 15'59.7" |
| Moon Equatorial Horizontal Parallax | 0°58'42.0" |
| ΔT | 28.4 s |
Eclipse season
[edit]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.
| April 23 Descending node (full moon) |
May 9 Ascending node (new moon) |
|---|---|
|
|
| Partial lunar eclipse Lunar Saros 111 |
Annular solar eclipse Solar Saros 137 |
Related eclipses
[edit]Eclipses in 1948
[edit]- A partial lunar eclipse on April 23.
- An annular solar eclipse on May 9.
- A penumbral lunar eclipse on October 18.
- A total solar eclipse on November 1.
Metonic
[edit]- Preceded by: Lunar eclipse of July 6, 1944
- Followed by: Lunar eclipse of February 11, 1952
Tzolkinex
[edit]- Preceded by: Lunar eclipse of March 13, 1941
- Followed by: Lunar eclipse of June 5, 1955
Half-Saros
[edit]- Preceded by: Solar eclipse of April 19, 1939
- Followed by: Solar eclipse of April 30, 1957
Tritos
[edit]- Preceded by: Lunar eclipse of May 25, 1937
- Followed by: Lunar eclipse of March 24, 1959
Lunar Saros 111
[edit]- Preceded by: Lunar eclipse of April 13, 1930
- Followed by: Lunar eclipse of May 4, 1966
Inex
[edit]- Preceded by: Lunar eclipse of May 15, 1919
- Followed by: Lunar eclipse of April 4, 1977
Triad
[edit]- Preceded by: Lunar eclipse of June 22, 1861
- Followed by: Lunar eclipse of February 22, 2035
Lunar eclipses of 1948–1951
[edit]| Descending node | Ascending node | |||||
|---|---|---|---|---|---|---|
| Saros | Date viewing |
Type chart |
Saros | Date viewing |
Type chart | |
| 111 | 1948 Apr 23
|
Partial
|
116 | 1948 Oct 18
|
Penumbral
| |
| 121 | 1949 Apr 13
|
Total
|
126 | 1949 Oct 07
|
Total
| |
| 131 | 1950 Apr 02
|
Total
|
136 | 1950 Sep 26
|
Total
| |
| 141 | 1951 Mar 23
|
Penumbral
|
146 | 1951 Sep 15
|
Penumbral
| |
Saros 111
[edit]Lunar Saros 111, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 11 total lunar eclipses. The first total lunar eclipse of this series was on April 19, 1353, and last was on August 4, 1533. The longest occurrence of this series was on June 12, 1443 when the totality lasted 106 minutes.
Half-Saros cycle
[edit]A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two annular solar eclipses of Solar Saros 118.
| April 19, 1939 | April 30, 1957 |
|---|---|
|
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See also
[edit]Notes
[edit]- ^ "April 23–24, 1948 Partial Lunar Eclipse". timeanddate. Retrieved 21 December 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 21 December 2024.
- ^ "Partial Lunar Eclipse of 1948 Apr 23" (PDF). NASA. Retrieved 21 December 2024.
- ^ "Partial Lunar Eclipse of 1948 Apr 23". EclipseWise.com. Retrieved 21 December 2024.
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
[edit]- 1948 Apr 23 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
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