August 2027 lunar eclipse
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A penumbral lunar eclipse will occur at the Moon’s ascending node of orbit on Tuesday, August 17, 2027, 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.
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.
Eclipse details
Shown below is a table displaying details about this particular eclipse. It describes various parameters pertaining to this eclipse.
| 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.
| 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
Eclipses in 2027
- An annular solar eclipse on February 6.
- A penumbral lunar eclipse on February 20.
- A penumbral lunar eclipse on July 18.
- A total solar eclipse on August 2.
- A penumbral lunar eclipse on August 17.
Metonic
- Preceded by: Lunar eclipse of October 28, 2023
- Followed by: Lunar eclipse of June 5, 2031
Tzolkinex
- Preceded by: Lunar eclipse of July 5, 2020
- Followed by: Lunar eclipse of September 28, 2034
Half-Saros
- Preceded by: Solar eclipse of August 11, 2018
- Followed by: Solar eclipse of August 21, 2036
Tritos
- Preceded by: Lunar eclipse of September 16, 2016
- Followed by: Lunar eclipse of July 16, 2038
Lunar Saros 148
- Preceded by: Lunar eclipse of August 6, 2009
- Followed by: Lunar eclipse of August 27, 2045
Inex
- Preceded by: Lunar eclipse of September 6, 1998
- Followed by: Lunar eclipse of July 26, 2056
Triad
- Preceded by: Lunar eclipse of October 16, 1940
- Followed by: Lunar eclipse of June 18, 2114
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.
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.
| 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.
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on 2568 Jul 10, lasting 104 minutes, 29 seconds. | 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 | |||||
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 2147 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1809 Apr 30 (Saros 128) | 1820 Mar 29 (Saros 129) | 1831 Feb 26 (Saros 130) | 1842 Jan 26 (Saros 131) | 1852 Dec 26 (Saros 132) | |||||
| 1863 Nov 25 (Saros 133) | 1874 Oct 25 (Saros 134) | 1885 Sep 24 (Saros 135) | 1896 Aug 23 (Saros 136) | 1907 Jul 25 (Saros 137) | |||||
| 1918 Jun 24 (Saros 138) | 1929 May 23 (Saros 139) | 1940 Apr 22 (Saros 140) | 1951 Mar 23 (Saros 141) | 1962 Feb 19 (Saros 142) | |||||
| 1973 Jan 18 (Saros 143) | 1983 Dec 20 (Saros 144) | 1994 Nov 18 (Saros 145) | 2005 Oct 17 (Saros 146) | 2016 Sep 16 (Saros 147) | |||||
| 2027 Aug 17 (Saros 148) | 2038 Jul 16 (Saros 149) | 2049 Jun 15 (Saros 150) | |||||||
| 2114 Dec 12 (Saros 156) | |||||||||
| 2147 Sep 09 (Saros 159) | |||||||||
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 | |||||
|---|---|---|---|---|---|
| 1825 Jan 04 (Saros 141) | 1853 Dec 15 (Saros 142) | 1882 Nov 25 (Saros 143) | |||
| 1911 Nov 06 (Saros 144) | 1940 Oct 16 (Saros 145) | 1969 Sep 25 (Saros 146) | |||
| 1998 Sep 06 (Saros 147) | 2027 Aug 17 (Saros 148) | 2056 Jul 26 (Saros 149) | |||
| 2085 Jul 07 (Saros 150) | 2114 Jun 18 (Saros 151) | 2143 May 28 (Saros 152) | |||
| 2172 May 08 (Saros 153) | |||||
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 partial solar eclipses of Solar Saros 155.
See also
External links
- Eclipse Predictions by Fred Espenak, NASA/GSFC