September 1933 lunar eclipse

September 1933 lunar eclipse
Penumbral eclipse
	The Moon's hourly motion shown right to left
Date	September 4, 1933
Gamma	1.1776
Magnitude	−0.3012
Saros cycle	146 (6 of 72)
Penumbral	221 minutes, 24 seconds
P1
Contacts (UTC)
P1	3:01:11
Greatest	4:51:56
P4	6:42:34
	← August 1933 January 1934 →

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Monday, September 4, 1933,^[1] with an umbral magnitude of −0.7336. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into 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 3.9 days after perigee (on August 31, 1933, at 6:30 UTC), the Moon's apparent diameter was larger.^[2]

This eclipse was the last of four penumbral lunar eclipses in 1933, with the others occurring on February 10, March 12, and August 5.

Visibility

The eclipse was completely visible over much of North and South America, seen rising over northwestern North America and the central Pacific Ocean and setting over Africa and Europe.^[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 4, 1933 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	0.69558
Umbral Magnitude	−0.30117
Gamma	1.17763
Sun Right Ascension	10h50m36.8s
Sun Declination	+07°22'09.8"
Sun Semi-Diameter	15'51.8"
Sun Equatorial Horizontal Parallax	08.7"
Moon Right Ascension	22h48m27.5s
Moon Declination	-06°21'19.9"
Moon Semi-Diameter	15'54.9"
Moon Equatorial Horizontal Parallax	0°58'24.5"
ΔT	23.9 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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of August–September 1933
August 5 Ascending node (full moon)	August 21 Descending node (new moon)	September 4 Ascending node (full moon)

Penumbral lunar eclipse Lunar Saros 108	Annular solar eclipse Solar Saros 134	Penumbral lunar eclipse Lunar Saros 146

Related eclipses

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 146

This eclipse is a part of Saros series 146, repeating every 18 years, 11 days, and containing 72 events. The series started with a penumbral lunar eclipse on July 11, 1843. It contains partial eclipses from October 17, 2005 through May 14, 2348; total eclipses from May 25, 2366 through November 16, 2654; and a second set of partial eclipses from November 27, 2672 through June 12, 2997. The series ends at member 72 as a penumbral eclipse on August 29, 3123.

The longest duration of totality will be produced by member 37 at 99 minutes, 22 seconds on August 8, 2492. 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 2492 Aug 08, lasting 99 minutes, 22 seconds.^[7]	Penumbral	Partial	Total	Central
	1843 Jul 11	2005 Oct 17	2366 May 25	2438 Jul 07
	Last
	Central	Total	Partial	Penumbral
	2546 Sep 11	2654 Nov 16	2997 Jun 12	3123 Aug 29

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 1–20 occur between 1843 and 2200:
1	2	3
1843 Jul 11	1861 Jul 21	1879 Aug 02

4	5	6
1897 Aug 12	1915 Aug 24	1933 Sep 04

7	8	9
1951 Sep 15	1969 Sep 25	1987 Oct 07

10	11	12
2005 Oct 17	2023 Oct 28	2041 Nov 08

13	14	15
2059 Nov 19	2077 Nov 29	2095 Dec 11

16	17	18
2113 Dec 22	2132 Jan 02	2150 Jan 13

19	20
2168 Jan 24	2186 Feb 04

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 153.