April 1930 lunar eclipse
| Partial eclipse | |||||||||||||
 The Moon's hourly motion shown right to left | |||||||||||||
| 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
[edit]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
[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 | 1.10669 |
| 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
[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 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
[edit]Eclipses in 1930
[edit]- 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
[edit]- Preceded by: Lunar eclipse of June 25, 1926
- Followed by: Lunar eclipse of January 30, 1934
Tzolkinex
[edit]- Preceded by: Lunar eclipse of March 3, 1923
- Followed by: Lunar eclipse of May 25, 1937
Half-Saros
[edit]- Preceded by: Solar eclipse of April 8, 1921
- Followed by: Solar eclipse of April 19, 1939
Tritos
[edit]- Preceded by: Lunar eclipse of May 15, 1919
- Followed by: Lunar eclipse of March 13, 1941
Lunar Saros 111
[edit]- Preceded by: Lunar eclipse of April 1, 1912
- Followed by: Lunar eclipse of April 23, 1948
Inex
[edit]- Preceded by: Lunar eclipse of May 3, 1901
- Followed by: Lunar eclipse of March 24, 1959
Triad
[edit]- Preceded by: Lunar eclipse of June 12, 1843
- Followed by: Lunar eclipse of February 11, 2017
Lunar eclipses of 1930–1933
[edit]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
[edit]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 | ||||
Tritos series
[edit]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 Mar 21 (Saros 100) |
1821 Feb 17 (Saros 101) |
1832 Jan 17 (Saros 102) |
1842 Dec 17 (Saros 103) |
||||||
| 1864 Oct 15 (Saros 105) |
1875 Sep 15 (Saros 106) |
1886 Aug 14 (Saros 107) |
1897 Jul 14 (Saros 108) |
1908 Jun 14 (Saros 109) | |||||
|
| ||||||||
| 1919 May 15 (Saros 110) |
1930 Apr 13 (Saros 111) |
1941 Mar 13 (Saros 112) |
1952 Feb 11 (Saros 113) |
1963 Jan 09 (Saros 114) | |||||
|
|
|
|
|
|
|
|
|
|
| 1973 Dec 10 (Saros 115) |
1984 Nov 08 (Saros 116) |
1995 Oct 08 (Saros 117) |
2006 Sep 07 (Saros 118) |
2017 Aug 07 (Saros 119) | |||||
|
|
|
|
|
|
|
|
|
|
| 2028 Jul 06 (Saros 120) |
2039 Jun 06 (Saros 121) |
2050 May 06 (Saros 122) |
2061 Apr 04 (Saros 123) |
2072 Mar 04 (Saros 124) | |||||
|
|
|
|
|
|
||||
| 2083 Feb 02 (Saros 125) |
2094 Jan 01 (Saros 126) |
2104 Dec 02 (Saros 127) |
2115 Nov 02 (Saros 128) |
2126 Oct 01 (Saros 129) | |||||
| 2137 Aug 30 (Saros 130) |
2148 Jul 31 (Saros 131) |
2159 Jun 30 (Saros 132) |
2170 May 30 (Saros 133) |
2181 Apr 29 (Saros 134) | |||||
| 2192 Mar 28 (Saros 135) | |||||||||
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).[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 118.
| April 8, 1921 | April 19, 1939 |
|---|---|
|
|
See also
[edit]Notes
[edit]- ^ "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
[edit]- 1930 Apr 13 chart Eclipse Predictions by Fred Espenak, NASA/GSFC
_(cropped).jpg)
