April 1930 lunar eclipse
Partial eclipse | |||||||||||||
Date | April 13, 1930 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Gamma | 0.9545 | ||||||||||||
Magnitude | 0.1065 | ||||||||||||
Saros cycle | 111 (62 of 71) | ||||||||||||
Partiality | 73 minutes, 22 seconds | ||||||||||||
Penumbral | 267 minutes, 18 seconds | ||||||||||||
| |||||||||||||
A partial lunar eclipse occurred at the Moon’s descending node of orbit on Sunday, April 13, 1930,[1] with an umbral magnitude of 0.1065. 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 3.8 days after perigee (on April 9, 1930, at 11:20 UTC), the Moon's apparent diameter was larger.[2]
Visibility
The eclipse was completely visible over North and South America, seen rising over eastern Australia and the central Pacific Ocean and setting over much of Europe and Africa.[3]
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 | 1.10669 |
Umbral Magnitude | 0.10650 |
Gamma | 0.95452 |
Sun Right Ascension | 01h23m32.1s |
Sun Declination | +08°47'25.3" |
Sun Semi-Diameter | 15'56.9" |
Sun Equatorial Horizontal Parallax | 08.8" |
Moon Right Ascension | 13h25m16.0s |
Moon Declination | -07°57'49.4" |
Moon Semi-Diameter | 15'56.7" |
Moon Equatorial Horizontal Parallax | 0°58'31.2" |
ΔT | 24.1 s |
Eclipse season
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 13 Descending node (full moon) |
April 28 Ascending node (new moon) |
---|---|
Partial lunar eclipse Lunar Saros 111 |
Hybrid solar eclipse Solar Saros 137 |
Related eclipses
Eclipses in 1930
- A partial lunar eclipse on April 13.
- A hybrid solar eclipse on April 28.
- A partial lunar eclipse on October 7.
- A total solar eclipse on October 21.
Metonic
- Preceded by: Lunar eclipse of June 25, 1926
- Followed by: Lunar eclipse of January 30, 1934
Tzolkinex
- Preceded by: Lunar eclipse of March 3, 1923
- Followed by: Lunar eclipse of May 25, 1937
Half-Saros
- Preceded by: Solar eclipse of April 8, 1921
- Followed by: Solar eclipse of April 19, 1939
Tritos
- Preceded by: Lunar eclipse of May 15, 1919
- Followed by: Lunar eclipse of March 13, 1941
Lunar Saros 111
- Preceded by: Lunar eclipse of April 1, 1912
- Followed by: Lunar eclipse of April 23, 1948
Inex
- Preceded by: Lunar eclipse of May 3, 1901
- Followed by: Lunar eclipse of March 24, 1959
Triad
- Preceded by: Lunar eclipse of June 12, 1843
- Followed by: Lunar eclipse of February 11, 2017
Lunar eclipses of 1930–1933
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 February 10, 1933 and August 5, 1933 occur in the next lunar year eclipse set.
Lunar eclipse series sets from 1930 to 1933 | ||||||||
---|---|---|---|---|---|---|---|---|
Descending node | Ascending node | |||||||
Saros | Date Viewing |
Type Chart |
Gamma | Saros | Date Viewing |
Type Chart |
Gamma | |
111 | 1930 Apr 13 |
Partial |
0.9545 | 116 | 1930 Oct 07 |
Partial |
−0.9812 | |
121 | 1931 Apr 02 |
Total |
0.2043 | 126 | 1931 Sep 26 |
Total |
−0.2698 | |
131 | 1932 Mar 22 |
Partial |
−0.4956 | 136 | 1932 Sep 14 |
Partial |
0.4664 | |
141 | 1933 Mar 12 |
Penumbral |
−1.2369 | 146 | 1933 Sep 04 |
Penumbral |
1.1776 |
Saros 111
This eclipse is a part of Saros series 111, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on June 10, 830 AD. It contains partial eclipses from September 14, 992 AD through April 8, 1335; total eclipses from April 19, 1353 through August 4, 1533; and a second set of partial eclipses from August 16, 1551 through April 23, 1948. The series ends at member 71 as a penumbral eclipse on July 19, 2092.
The longest duration of totality was produced by member 35 at 106 minutes, 14 seconds on June 12, 1443. 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 1443 Jun 12, lasting 106 minutes, 14 seconds.[7] | Penumbral | Partial | Total | Central |
830 Jun 10 |
992 Sep 14 |
1353 Apr 19 |
1389 May 10 | |
Last | ||||
Central | Total | Partial | Penumbral | |
1497 Jul 14 |
1533 Aug 04 |
1948 Apr 23 |
2092 Jul 19 |
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.
Series members 55–71 occur between 1801 and 2092: | |||||
---|---|---|---|---|---|
55 | 56 | 57 | |||
1804 Jan 26 | 1822 Feb 06 | 1840 Feb 17 | |||
58 | 59 | 60 | |||
1858 Feb 27 | 1876 Mar 10 | 1894 Mar 21 | |||
61 | 62 | 63 | |||
1912 Apr 01 | 1930 Apr 13 | 1948 Apr 23 | |||
64 | 65 | 66 | |||
1966 May 04 | 1984 May 15 | 2002 May 26 | |||
67 | 68 | 69 | |||
2020 Jun 05 | 2038 Jun 17 | 2056 Jun 27 | |||
70 | 71 | ||||
2074 Jul 08 | 2092 Jul 19 | ||||
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 118.
April 8, 1921 | April 19, 1939 |
---|---|
See also
Notes
- ^ "April 12–13, 1930 Partial Lunar Eclipse". timeanddate. Retrieved 16 December 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 16 December 2024.
- ^ "Partial Lunar Eclipse of 1930 Apr 13" (PDF). NASA. Retrieved 16 December 2024.
- ^ "Partial Lunar Eclipse of 1930 Apr 13". EclipseWise.com. Retrieved 16 December 2024.
- ^ 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.
- ^ "NASA - Catalog of Lunar Eclipses of Saros 111". eclipse.gsfc.nasa.gov.
- ^ Listing of Eclipses of series 111
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
- 1930 Apr 13 chart Eclipse Predictions by Fred Espenak, NASA/GSFC