August 2027 lunar eclipse

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

Lunar eclipse series sets from 2024–2027
Descending node				Ascending node
Saros	Date	Type Viewing	Gamma	Saros	Date Viewing	Type Chart	Gamma
113	2024 Mar 25	Penumbral	1.06098	118	2024 Sep 18	Partial	−0.97920
123	2025 Mar 14	Total	0.34846	128	2025 Sep 07	Total	−0.27521
133	2026 Mar 03	Total	−0.37651	138	2026 Aug 28	Partial	0.49644
143	2027 Feb 20	Penumbral	−1.04803	148	2027 Aug 17	Penumbral	1.27974

Last set	2023 May 05			Last set	2023 Oct 28

Next set	2028 Jan 12			Next set	2027 Jul 18

Saros 148

It is part of Saros cycle 148.

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

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 partial solar eclipses of Solar Saros 155.