en May 2170 lunar eclipse

May 2170 lunar eclipse
Total eclipse
Date	May 30, 2170
Gamma	0.0174
Magnitude	1.8330
Saros cycle	133 (35 of 71)
Totality	101 minutes, 41 seconds
Partiality	219 minutes, 22 seconds
Penumbral	335 minutes, 22 seconds
P1
Contacts (UTC)
P1	22:04:00
U1	23:01:56
U2	0:00:47
Greatest	0:51:38
U3	1:42:28
U4	2:41:18
P4	3:39:22
	← December 2169 November 2170 →

A total lunar eclipse will occur at the Moon’s descending node of orbit on Wednesday, May 30, 2170,^[1] with an umbral magnitude of 1.7488. It will be a central lunar eclipse, in which part of the Moon will pass through the center of the Earth's shadow. 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 about 3.6 days after perigee (on May 26, 2170, at 10:15 UTC), the Moon's apparent diameter will be larger.^[2]

This will be the greatest lunar eclipse of Lunar Saros 133 as well as the largest and darkest lunar eclipse of the 22nd century.^[3]

Visibility

The eclipse will be completely visible over central and eastern South America, western Europe, and much of Africa, seen rising over western South America and much of North America and setting over eastern Europe, the western half of Asia, and western Australia.

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.^[4]

May 30, 2170 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	2.81880
Umbral Magnitude	1.83301
Gamma	0.01743
Sun Right Ascension	04h28m29.8s
Sun Declination	+21°45'15.5"
Sun Semi-Diameter	15'47.2"
Sun Equatorial Horizontal Parallax	08.7"
Moon Right Ascension	16h28m30.9s
Moon Declination	-21°44'16.0"
Moon Semi-Diameter	16'00.8"
Moon Equatorial Horizontal Parallax	0°58'46.3"
ΔT	219.6 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 May–June 2170
May 16 Ascending node (new moon)	May 30 Descending node (full moon)	June 14 Ascending node (new moon)

Partial solar eclipse Solar Saros 121	Total lunar eclipse Lunar Saros 133	Partial solar eclipse Solar Saros 159

Related eclipses

Eclipses in 2170

Lunar eclipses of 2168–2172

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 lunar eclipses on January 24, 2168 (partial), July 20, 2168 (penumbral), and January 13, 2169 (penumbral) occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on April 9, 2172 and October 2, 2172 occur in the next lunar year eclipse set.

Lunar eclipse series sets from 2168 to 2172
Ascending node				Descending node
Saros	Date Viewing	Type Chart	Gamma	Saros	Date Viewing	Type Chart	Gamma
118	2168 Dec 14	Penumbral	−1.1945	123	2169 Jun 09	Partial	0.8158
128	2169 Dec 04	Partial	−0.5488	133	2170 May 30	Total	0.0174
138	2170 Nov 23	Total	0.1554	143	2171 May 19	Partial	−0.7166
148	2171 Nov 12	Partial	0.8584	153	2172 May 08	Penumbral	−1.4275
158	2172 Oct 31	Penumbral	1.5197

Saros 133

Lunar saros series 133, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 54 umbral lunar eclipses (33 partial lunar eclipses and 21 total lunar eclipses).

Greatest	First
The greatest eclipse of the series will occur on 2170 May 30, lasting 102 minutes. ^[3]	Penumbral	Partial	Total	Central
	1557 May 13	1683 Aug 07	1917 Dec 28	2098 Apr 15
	Last
	Central	Total	Partial	Penumbral
	2224 Jul 01	2278 Aug 03	2429 Dec 11	2754 Jun 26

There are 10 series events between 1901 and 2100, grouped into threes (called an exeligmos), each column with approximately the same viewing longitude on Earth.

1901–2100
1917 Dec 28	1936 Jan 08	1954 Jan 19

1972 Jan 30	1990 Feb 09	2008 Feb 21

2026 Mar 03	2044 Mar 13	2062 Mar 25

2080 Apr 04	2098 Apr 15

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).^[6] This lunar eclipse is related to two annular solar eclipses of Solar Saros 140.