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August 2027 lunar eclipse
Penumbral eclipse
	The Moon's hourly motion shown right to left
Date	August 17, 2027
Gamma	1.2797
Magnitude	−0.5234
Saros cycle	148 (4 of 71)
Penumbral	218 minutes, 35 seconds
P1
Contacts (UTC)
P1	5:24:29
Greatest	7:13:43
P4	9:03:03
	← July 2027 January 2028 →

A penumbral lunar eclipse will occur at the Moon’s ascending node of orbit on Tuesday, August 17, 2027,^[1] with an umbral magnitude of −0.5234. 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 1.9 days after apogee (on August 15, 2027, at 10:20 UTC), the Moon's apparent diameter will be smaller.^[2]

Visibility

The eclipse will be completely visible over North and South America, seen rising over Australia and the central Pacific Ocean and setting over west Africa.^[3]

Eclipse details

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

August 17, 2027 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	0.54758
Umbral Magnitude	−0.52344
Gamma	1.27974
Sun Right Ascension	09h45m58.6s
Sun Declination	+13°27'30.2"
Sun Semi-Diameter	15'47.8"
Sun Equatorial Horizontal Parallax	08.7"
Moon Right Ascension	21h43m58.8s
Moon Declination	-12°24'40.9"
Moon Semi-Diameter	14'44.9"
Moon Equatorial Horizontal Parallax	0°54'07.8"
ΔT	72.8 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 July–August 2027
July 18 Ascending node (full moon)	August 2 Descending node (new moon)	August 17 Ascending node (full moon)

Penumbral lunar eclipse Lunar Saros 110	Total solar eclipse Solar Saros 136	Penumbral lunar eclipse Lunar Saros 148

Related eclipses

Lunar eclipses of 2024–2027

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 eclipse on July 18, 2027 occurs in the next lunar year eclipse set.

Lunar eclipse series sets from 2024 to 2027
Descending node				Ascending node
Saros	Date Viewing	Type Chart	Gamma	Saros	Date Viewing	Type Chart	Gamma
113	2024 Mar 25	Penumbral	1.0610	118	2024 Sep 18	Partial	−0.9792
123	2025 Mar 14	Total	0.3485	128	2025 Sep 07	Total	−0.2752
133	2026 Mar 03	Total	−0.3765	138	2026 Aug 28	Partial	0.4964
143	2027 Feb 20	Penumbral	−1.0480	148	2027 Aug 17	Penumbral	1.2797

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 lunar eclipse sets 1951–2027
Descending node			Ascending node
Saros	Date	Type	Saros	Date	Type
103	1951 Feb 21.88	Penumbral	108	1951 Aug 17.13	Penumbral

113	1970 Feb 21.35	Partial	118	1970 Aug 17.14	Partial

123	1989 Feb 20.64	Total	128	1989 Aug 17.13	Total

133	2008 Feb 21.14	Total	138	2008 Aug 16.88	Partial

143	2027 Feb 20.96	Penumbral	148	2027 Aug 17.30	Penumbral

Saros 148

This eclipse is a part of Saros series 148, repeating every 18 years, 11 days, and containing 70 events. The series started with a penumbral lunar eclipse on July 15, 1973. It contains partial eclipses from October 10, 2117 through May 5, 2460; total eclipses from May 17, 2478 through September 14, 2676; and a second set of partial eclipses from September 25, 2694 through May 25, 3091. The series ends at member 70 as a penumbral eclipse on August 9, 3217.

The longest duration of totality will be produced by member 37 at 104 minutes, 29 seconds on July 10, 2568. 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 2568 Jul 10, lasting 104 minutes, 29 seconds.^[7]	Penumbral	Partial	Total	Central
	1973 Jul 15	2117 Oct 10	2478 May 25	2514 Jun 08
	Last
	Central	Total	Partial	Penumbral
	2622 Aug 13	2676 Sep 14	3091 May 25	3217 Aug 09

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 1–13 occur between 1973 and 2200:
1	2	3
1973 Jul 15	1991 Jul 26	2009 Aug 06

4	5	6
2027 Aug 17	2045 Aug 27	2063 Sep 07

7	8	9
2081 Sep 18	2099 Sep 29	2117 Oct 10

10	11	12
2135 Oct 22	2153 Nov 01	2171 Nov 12

13
2189 Nov 22

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 155.