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 will occur 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

Lunar eclipse series sets from 1930–1933
Descending node			Ascending node
Saros	Date viewing	Type chart	Saros	Date viewing	Type chart
111	1930 Apr 13	Partial	116	1930 Oct 07	Partial
121	1931 Apr 02	Total	126	1931 Sep 26	Total
131	1932 Mar 22	Partial	136	1932 Sep 14	Partial
141	1933 Mar 12	Penumbral	146	1933 Sep 04	Penumbral

Half-Saros cycle

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 total solar eclipses of Solar Saros 153.