October 2023 lunar eclipse

A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, October 28, 2023,^[1] with an umbral magnitude of 0.1234. 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 2.9 days after perigee (on October 25, 2023, at 23:00 UTC), the Moon's apparent diameter was larger.^[2]

October 2023 lunar eclipse

Partial eclipse
Eclipse seen from Bandung, Indonesia
Date	October 28, 2023
Gamma	0.9471
Magnitude	0.1234
Saros cycle	146 (11 of 72)
Partiality	77 minutes, 21 seconds
Penumbral	264 minutes, 34 seconds
Contacts (UTC) P1 18:01:47 U1 19:35:18 Greatest 20:14:03 U4 20:52:39 P4 22:26:20
← May 2023 March 2024 →

Visibility

The eclipse was completely visible over Africa, Europe, and Asia, seen rising over northeastern North America and eastern South America and setting over Australia and the western Pacific Ocean.^[3]

Visibility map

Gallery

• 
  Logroño, Spain, 20:08 UTC
• 
  Lunar eclipse in Saratov, Russia, 20:12 UTC
• 
  Surabaya, Indonesia, 20:14 UTC
• 
  Lunar eclipse in Vladivostok, Russia, 20:15 UTC
• 
  Lunar eclipse in Hefei, China, 20:17 UTC
• 
  Partial from Kumbakonam, India, 20:21 UTC
• 
  Jakarta, Indonesia, 20:23 UTC
• 
  Kuching, Malaysia, 19:35 UTC-20:14 UTC
• 
  Sequence of lunar eclipse from Oria, Italy

Eclipse details

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

October 28, 2023 Lunar Eclipse Parameters

Parameter	Value
Penumbral Magnitude	1.11997
Umbral Magnitude	0.12393
Gamma	0.94716
Sun Right Ascension	14h11m25.9s
Sun Declination	-13°14'10.5"
Sun Semi-Diameter	16'05.9"
Sun Equatorial Horizontal Parallax	08.9"
Moon Right Ascension	02h09m47.6s
Moon Declination	+14°05'01.6"
Moon Semi-Diameter	16'09.7"
Moon Equatorial Horizontal Parallax	0°59'18.9"
ΔT	71.1 s

Eclipse season

See also: Eclipse cycle

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.

Eclipse season of October 2023

October 14 Descending node (new moon)	October 28 Ascending node (full moon)
Annular solar eclipse Solar Saros 134	Partial lunar eclipse Lunar Saros 146

Related eclipses

Eclipses in 2023

• A hybrid solar eclipse on April 20.
• A penumbral lunar eclipse on May 5.
• An annular solar eclipse on October 14.
• A partial lunar eclipse on October 28.

Metonic

• Preceded by: Lunar eclipse of January 10, 2020
• Followed by: Lunar eclipse of August 17, 2027

Tzolkinex

• Preceded by: Lunar eclipse of September 16, 2016
• Followed by: Lunar eclipse of December 9, 2030

Half-Saros

• Preceded by: Solar eclipse of October 23, 2014
• Followed by: Solar eclipse of November 3, 2032

Tritos

• Preceded by: Lunar eclipse of November 28, 2012
• Followed by: Lunar eclipse of September 28, 2034

Lunar Saros 146

• Preceded by: Lunar eclipse of October 17, 2005
• Followed by: Lunar eclipse of November 8, 2041

Inex

• Preceded by: Lunar eclipse of November 18, 1994
• Followed by: Lunar eclipse of October 8, 2052

Triad

• Preceded by: Lunar eclipse of December 28, 1936
• Followed by: Lunar eclipse of August 29, 2110

Lunar eclipses of 2020–2023

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 January 10, 2020 and July 5, 2020 occur in the previous lunar year eclipse set.

Lunar eclipse series sets from 2020 to 2023
Descending node					Ascending node
Saros	Date Viewing	Type Chart	Gamma		Saros	Date Viewing	Type Chart	Gamma
111	2020 Jun 05	Penumbral	1.2406		116	2020 Nov 30	Penumbral	−1.1309
121	2021 May 26	Total	0.4774		126	2021 Nov 19	Partial	−0.4553
131	2022 May 16	Total	−0.2532		136	2022 Nov 08	Total	0.2570
141	2023 May 05	Penumbral	−1.0350		146	2023 Oct 28	Partial	0.9472

Metonic series

The metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the Earth's shadow will in nearly the same location relative to the background stars.

Metonic events: May 4 and October 28
Descending node	Ascending node
1966 May 4 - Penumbral (111) 1985 May 4 - Total (121) 2004 May 4 - Total (131) 2023 May 5 - Penumbral (141)	1966 Oct 29 - Penumbral (116) 1985 Oct 28 - Total (126) 2004 Oct 28 - Total (136) 2023 Oct 28 - Partial (146) 2042 Oct 28 - Penumbral (156)

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

Tritos series

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 2132
1805 Jul 11 (Saros 126)		1816 Jun 10 (Saros 127)		1827 May 11 (Saros 128)		1838 Apr 10 (Saros 129)		1849 Mar 09 (Saros 130)
1860 Feb 07 (Saros 131)		1871 Jan 06 (Saros 132)		1881 Dec 05 (Saros 133)		1892 Nov 04 (Saros 134)		1903 Oct 06 (Saros 135)
1914 Sep 04 (Saros 136)		1925 Aug 04 (Saros 137)		1936 Jul 04 (Saros 138)		1947 Jun 03 (Saros 139)		1958 May 03 (Saros 140)
1969 Apr 02 (Saros 141)		1980 Mar 01 (Saros 142)		1991 Jan 30 (Saros 143)		2001 Dec 30 (Saros 144)		2012 Nov 28 (Saros 145)
2023 Oct 28 (Saros 146)		2034 Sep 28 (Saros 147)		2045 Aug 27 (Saros 148)		2056 Jul 26 (Saros 149)		2067 Jun 27 (Saros 150)
2132 Dec 22 (Saros 156)

Inex series

This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200
1821 Mar 18 (Saros 139)		1850 Feb 26 (Saros 140)		1879 Feb 07 (Saros 141)
1908 Jan 18 (Saros 142)		1936 Dec 28 (Saros 143)		1965 Dec 08 (Saros 144)
1994 Nov 18 (Saros 145)		2023 Oct 28 (Saros 146)		2052 Oct 08 (Saros 147)
2081 Sep 18 (Saros 148)		2110 Aug 29 (Saros 149)		2139 Aug 10 (Saros 150)
2168 Jul 20 (Saros 151)		2197 Jun 29 (Saros 152)

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 partial solar eclipses of Solar Saros 153.

October 23, 2014	November 3, 2032

See also

• List of lunar eclipses and List of 21st-century lunar eclipses