April 1921 lunar eclipse - Misplaced Pages

Partial lunar eclipse in 1921

April 1921 lunar eclipse

Total eclipse

The Moon's hourly motion shown right to left

Date

April 22, 1921

Gamma

0.4269

Magnitude

1.0678

Saros cycle

130 (29 of 72)

Totality

40 minutes, 7 seconds

Partiality

202 minutes, 2 seconds

Penumbral

331 minutes, 54 seconds

Contacts (UTC)
P1	4:58:21
U1	6:03:14
U2	7:24:12
Greatest	7:44:17
U3	8:04:19
U4	9:25:16
P4	10:30:16

← October 1920October 1921 →

A total lunar eclipse occurred at the Moon’s ascending node of orbit on Friday, April 22, 1921, with an umbral magnitude of 1.0678. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring only about 5.6 days after perigee (on April 16, 1921, at 16:10 UTC), the Moon's apparent diameter was larger.

This lunar eclipse was the third of an almost tetrad, with the others being on May 3, 1920 (total); October 27, 1920 (total); and October 16, 1921 (partial).

This was the first total lunar eclipse of Lunar Saros 130.

Visibility

The eclipse was completely visible over much of North America and western South America, seen rising over northeast Asia and Australia and setting over eastern South America, western Europe, and west Africa.

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.

April 22, 1921 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	2.08154
Umbral Magnitude	1.06782
Gamma	0.42693
Sun Right Ascension	01h57m53.3s
Sun Declination	+12°02'44.0"
Sun Semi-Diameter	15'54.4"
Sun Equatorial Horizontal Parallax	08.7"
Moon Right Ascension	13h58m18.6s
Moon Declination	-11°38'56.5"
Moon Semi-Diameter	15'41.5"
Moon Equatorial Horizontal Parallax	0°57'35.3"
ΔT	22.2 s

Eclipse season

Related eclipses

Eclipses in 1921

Lunar eclipses of 1919–1922

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Saros 130

Lunar saros series 130, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 56 umbral lunar eclipses (42 partial lunar eclipses and 14 total lunar eclipses). Solar Saros 137 interleaves with this lunar saros with an event occurring every 9 years 5 days alternating between each saros series.

Greatest	First
The greatest eclipse of the series will occur on 2029 Jun 26, lasting 102 minutes.	Penumbral	Partial	Total	Central
	1416 Jun 10	1560 Sep 4	1921 Apr 22	1957 May 13
	Last
	Central	Total	Partial	Penumbral
	2083 Jul 29	2155 Sep 11	2552 May 10	2678 Jul 26

1901–2200
1903 Apr 12	1921 Apr 22	1939 May 3

1957 May 13	1975 May 25	1993 Jun 4

2011 Jun 15	2029 Jun 26	2047 Jul 7

2065 Jul 17	2083 Jul 29

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two annular solar eclipses of Solar Saros 137.