| Partial eclipse | |||||||||||||
 The Moon's hourly motion shown right to left | |||||||||||||
| Date | July 27, 2037 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gamma | −0.5582 | ||||||||||||
| Magnitude | 0.8108 | ||||||||||||
| Saros cycle | 139 (23 of 81) | ||||||||||||
| Partiality | 192 minutes, 25 seconds | ||||||||||||
| Penumbral | 340 minutes, 49 seconds | ||||||||||||
| |||||||||||||
A partiallunar eclipse will occur at the Moon’sdescending node of orbit on Monday, July 27, 2037,[1] with an umbralmagnitude of 0.8108. A lunar eclipse occurs when theMoon moves into theEarth'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 asolar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on thenight side of Earth. Occurring about 4.1 days beforeapogee (on July 31, 2037, at 8:30 UTC), the Moon's apparent diameter will be smaller.[2]
The eclipse will be completely visible over easternNorth America andSouth America, seen rising over western North America and the easternPacific Ocean and setting overAfrica andEurope.[3]
 |
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]
| Parameter | Value |
|---|---|
| Penumbral Magnitude | 1.85965 |
| Umbral Magnitude | 0.81075 |
| Gamma | −0.55822 |
| Sun Right Ascension | 08h27m18.9s |
| Sun Declination | +19°07'58.8" |
| Sun Semi-Diameter | 15'45.0" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 20h27m37.3s |
| Moon Declination | -19°38'25.9" |
| Moon Semi-Diameter | 15'00.9" |
| Moon Equatorial Horizontal Parallax | 0°55'06.5" |
| ΔT | 77.8 s |
This eclipse is part of aneclipse 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 afortnight.
| July 13 Ascending node (new moon) | July 27 Descending node (full moon) |
|---|---|
 | |
| Total solar eclipse Solar Saros 127 | Partial lunar eclipse Lunar Saros 139 |
This eclipse is a member of asemester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternatingnodes of the Moon's orbit.[5]
The penumbral lunar eclipses onJune 17, 2038 andDecember 11, 2038 occur in the next lunar year eclipse set.
| Lunar eclipse series sets from 2035 to 2038 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma | |
| 114 | 2035 Feb 22 | Penumbral | −1.0357 | 119 | 2035 Aug 19 | Partial | 0.9433 | |
| 124 | 2036 Feb 11 | Total | −0.3110 | 129 | 2036 Aug 07 | Total | 0.2004 | |
| 134 | 2037 Jan 31 | Total | 0.3619 | 139 | 2037 Jul 27 | Partial | −0.5582 | |
| 144 | 2038 Jan 21 | Penumbral | 1.0710 | 149 | 2038 Jul 16 | Penumbral | −1.2837 | |
This eclipse is a part ofSaros series 139, repeating every 18 years, 11 days, and containing 79 events. The series started with a penumbral lunar eclipse on December 9, 1658. It contains partial eclipses fromJune 3, 1947 throughAugust 7, 2055; total eclipses fromAugust 17, 2073 through May 30, 2542; and a second set of partial eclipses from June 9, 2560 through August 25, 2686. The series ends at member 75 as a penumbral eclipse on April 13, 3065.
The longest duration of totality will be produced by member 31 at 102 minutes, 39 seconds on November 2, 2199. All eclipses in this series occur at the Moon’sdescending node of orbit.[6]
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on2199 Nov 02, lasting 102 minutes, 39 seconds.[7] | Penumbral | Partial | Total | Central |
| 1658 Dec 09 | 1947 Jun 03 | 2073 Aug 17 | 2109 Sep 09 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2488 Apr 26 | 2542 May 30 | 2686 Aug 25 | 3065 Apr 13 | |
Eclipses are tabulated in three columns; every third eclipse in the same column is oneexeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
| Series members 9–31 occur between 1801 and 2200: | |||||
|---|---|---|---|---|---|
| 9 | 10 | 11 | |||
| 1803 Mar 08 | 1821 Mar 18 | 1839 Mar 30 | |||
| 12 | 13 | 14 | |||
| 1857 Apr 09 | 1875 Apr 20 | 1893 Apr 30 | |||
| 15 | 16 | 17 | |||
| 1911 May 13 | 1929 May 23 | 1947 Jun 03 | |||
 |  |  |  | |  |
| 18 | 19 | 20 | |||
| 1965 Jun 14 | 1983 Jun 25 | 2001 Jul 05 | |||
 |  |  |  |  |  |
| 21 | 22 | 23 | |||
| 2019 Jul 16 | 2037 Jul 27 | 2055 Aug 07 | |||
 |  | | |  |  |
| 24 | 25 | 26 | |||
| 2073 Aug 17 | 2091 Aug 29 | 2109 Sep 09 | |||
| 27 | 28 | 29 | |||
| 2127 Sep 20 | 2145 Sep 30 | 2163 Oct 12 | |||
| 30 | 31 | ||||
| 2181 Oct 22 | 2199 Nov 02 | ||||
This eclipse is a part of atritos cycle, repeating at alternating nodes every 135synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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 2200 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1808 May 10 (Saros 118) | 1819 Apr 10 (Saros 119) | 1830 Mar 09 (Saros 120) | 1841 Feb 06 (Saros 121) | 1852 Jan 07 (Saros 122) | |||||
| 1862 Dec 06 (Saros 123) | 1873 Nov 04 (Saros 124) | 1884 Oct 04 (Saros 125) | 1895 Sep 04 (Saros 126) | 1906 Aug 04 (Saros 127) | |||||
 |  | ||||||||
| 1917 Jul 04 (Saros 128) | 1928 Jun 03 (Saros 129) | 1939 May 03 (Saros 130) | 1950 Apr 02 (Saros 131) | 1961 Mar 02 (Saros 132) | |||||
 |  |  |  |  |  |  |  |  |  |
| 1972 Jan 30 (Saros 133) | 1982 Dec 30 (Saros 134) | 1993 Nov 29 (Saros 135) | 2004 Oct 28 (Saros 136) | 2015 Sep 28 (Saros 137) | |||||
 |  |  |  |  |  |  |  |  |  |
| 2026 Aug 28 (Saros 138) | 2037 Jul 27 (Saros 139) | 2048 Jun 26 (Saros 140) | 2059 May 27 (Saros 141) | 2070 Apr 25 (Saros 142) | |||||
 |  | | |  |  |  |  |  |  |
| 2081 Mar 25 (Saros 143) | 2092 Feb 23 (Saros 144) | 2103 Jan 23 (Saros 145) | 2113 Dec 22 (Saros 146) | 2124 Nov 21 (Saros 147) | |||||
| 2135 Oct 22 (Saros 148) | 2146 Sep 20 (Saros 149) | 2157 Aug 20 (Saros 150) | 2168 Jul 20 (Saros 151) | 2179 Jun 19 (Saros 152) | |||||
| 2190 May 19 (Saros 153) | |||||||||
This eclipse is a part of the long periodinex cycle, repeating at alternating nodes, every 358synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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 | |||||
|---|---|---|---|---|---|
| 1806 Jan 05 (Saros 131) | 1834 Dec 16 (Saros 132) | 1863 Nov 25 (Saros 133) | |||
| 1892 Nov 04 (Saros 134) | 1921 Oct 16 (Saros 135) | 1950 Sep 26 (Saros 136) | |||
 |  |  |  | ||
| 1979 Sep 06 (Saros 137) | 2008 Aug 16 (Saros 138) | 2037 Jul 27 (Saros 139) | |||
 |  |  |  | | |
| 2066 Jul 07 (Saros 140) | 2095 Jun 17 (Saros 141) | 2124 May 28 (Saros 142) | |||
| 2153 May 08 (Saros 143) | 2182 Apr 18 (Saros 144) | ||||
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (ahalf saros).[8] This lunar eclipse is related to two total solar eclipses ofSolar Saros 146.
| July 22, 2028 | August 2, 2046 |
|---|---|
 |  |
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