| Total eclipse | |||||||||||||||||
 The Moon's hourly motion shown right to left | |||||||||||||||||
| Date | February 11, 2055 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gamma | 0.3526 | ||||||||||||||||
| Magnitude | 1.2258 | ||||||||||||||||
| Saros cycle | 134 (29 of 73) | ||||||||||||||||
| Totality | 66 minutes, 0 seconds | ||||||||||||||||
| Partiality | 198 minutes, 25 seconds | ||||||||||||||||
| Penumbral | 312 minutes, 52 seconds | ||||||||||||||||
| |||||||||||||||||
A totallunar eclipse will occur at the Moon’sascending node of orbit on Thursday, February 11, 2055,[1] with an umbralmagnitude of 1.2258. A lunar eclipse occurs when theMoon moves into theEarth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon'sshadow is smaller. Occurring only about 15 hours beforeperigee (on February 12, 2055, at 13:00 UTC), the Moon's apparent diameter will be larger.[2]
This lunar eclipse will be the third of analmost tetrad, with the others being onFebruary 22, 2054 (total);August 18, 2054 (total); andAugust 7, 2055 (partial).
The eclipse will be completely visible overAfrica,Europe, andwest,central, andsouth Asia, seen rising over much ofNorth andSouth America and setting overeast Asia and westernAustralia.[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 | 2.19816 |
| Umbral Magnitude | 1.22577 |
| Gamma | 0.35264 |
| Sun Right Ascension | 21h42m03.5s |
| Sun Declination | -13°47'10.8" |
| Sun Semi-Diameter | 16'12.3" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 09h42m24.2s |
| Moon Declination | +14°08'09.1" |
| Moon Semi-Diameter | 16'39.9" |
| Moon Equatorial Horizontal Parallax | 1°01'09.9" |
| ΔT | 88.5 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.
| January 27 Descending node (new moon) | February 11 Ascending node (full moon) |
|---|---|
 | |
| Partial solar eclipse Solar Saros 122 | Total lunar eclipse Lunar Saros 134 |
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 27, 2056 andDecember 22, 2056 occur in the next lunar year eclipse set.
| Lunar eclipse series sets from 2053 to 2056 | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||||
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma | |
| 114 | 2053 Mar 04 | Penumbral | −1.0530 | 119 | 2053 Aug 29 | Penumbral | 1.0165 | |
| 124 | 2054 Feb 22 | Total | −0.3242 | 129 | 2054 Aug 18 | Total | 0.2806 | |
| 134 | 2055 Feb 11 | Total | 0.3526 | 139 | 2055 Aug 07 | Partial | −0.4769 | |
| 144 | 2056 Feb 01 | Penumbral | 1.0682 | 149 | 2056 Jul 26 | Partial | −1.2048 | |
This eclipse is a part ofSaros series 134, repeating every 18 years, 11 days, and containing 72 events. The series started with a penumbral lunar eclipse on April 1, 1550. It contains partial eclipses from July 7, 1694 through October 13, 1856; total eclipses from October 25, 1874 through July 26, 2325; and a second set of partial eclipses from August 7, 2343 through November 12, 2505. The series ends at member 72 as a penumbral eclipse on May 28, 2830.
The longest duration of totality will be produced by member 38 at 100 minutes, 23 seconds on May 22, 2217. All eclipses in this series occur at the Moon’sascending node of orbit.[6]
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series will occur on2217 May 22, lasting 100 minutes, 23 seconds.[7] | Penumbral | Partial | Total | Central |
| 1550 Apr 01 | 1694 Jul 07 | 1874 Oct 25 | 2127 Mar 28 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 2289 Jul 04 | 2325 Jul 26 | 2505 Nov 12 | 2830 May 28 | |
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 15–37 occur between 1801 and 2200: | |||||
|---|---|---|---|---|---|
| 15 | 16 | 17 | |||
| 1802 Sep 11 | 1820 Sep 22 | 1838 Oct 03 | |||
| 18 | 19 | 20 | |||
| 1856 Oct 13 | 1874 Oct 25 | 1892 Nov 04 | |||
| 21 | 22 | 23 | |||
| 1910 Nov 17 | 1928 Nov 27 | 1946 Dec 08 | |||
 |  |  |  |  |  |
| 24 | 25 | 26 | |||
| 1964 Dec 19 | 1982 Dec 30 | 2001 Jan 09 | |||
 |  |  |  |  |  |
| 27 | 28 | 29 | |||
| 2019 Jan 21 | 2037 Jan 31 | 2055 Feb 11 | |||
 |  |  |  | | |
| 30 | 31 | 32 | |||
| 2073 Feb 22 | 2091 Mar 05 | 2109 Mar 17 | |||
 |  | ||||
| 33 | 34 | 35 | |||
| 2127 Mar 28 | 2145 Apr 07 | 2163 Apr 19 | |||
| 36 | 37 | ||||
| 2181 Apr 29 | 2199 May 10 | ||||
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 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1804 Jan 26 (Saros 111) | 1814 Dec 26 (Saros 112) | 1825 Nov 25 (Saros 113) | 1836 Oct 24 (Saros 114) | 1847 Sep 24 (Saros 115) | |||||
| 1858 Aug 24 (Saros 116) | 1869 Jul 23 (Saros 117) | 1880 Jun 22 (Saros 118) | 1891 May 23 (Saros 119) | 1902 Apr 22 (Saros 120) | |||||
 |  | ||||||||
| 1913 Mar 22 (Saros 121) | 1924 Feb 20 (Saros 122) | 1935 Jan 19 (Saros 123) | 1945 Dec 19 (Saros 124) | 1956 Nov 18 (Saros 125) | |||||
 |  |  |  |  |  |  |  |  |  |
| 1967 Oct 18 (Saros 126) | 1978 Sep 16 (Saros 127) | 1989 Aug 17 (Saros 128) | 2000 Jul 16 (Saros 129) | 2011 Jun 15 (Saros 130) | |||||
 |  |  |  |  |  |  |  |  |  |
| 2022 May 16 (Saros 131) | 2033 Apr 14 (Saros 132) | 2044 Mar 13 (Saros 133) | 2055 Feb 11 (Saros 134) | 2066 Jan 11 (Saros 135) | |||||
 |  |  |  |  |  | | |  |  |
| 2076 Dec 10 (Saros 136) | 2087 Nov 10 (Saros 137) | 2098 Oct 10 (Saros 138) | 2109 Sep 09 (Saros 139) | 2120 Aug 09 (Saros 140) | |||||
 |  |  |  |  |  | ||||
| 2131 Jul 10 (Saros 141) | 2142 Jun 08 (Saros 142) | 2153 May 08 (Saros 143) | 2164 Apr 07 (Saros 144) | 2175 Mar 07 (Saros 145) | |||||
| 2186 Feb 04 (Saros 146) | 2197 Jan 04 (Saros 147) | ||||||||
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 | |||||
|---|---|---|---|---|---|
| 1823 Jul 23 (Saros 126) | 1852 Jul 01 (Saros 127) | 1881 Jun 12 (Saros 128) | |||
| 1910 May 24 (Saros 129) | 1939 May 03 (Saros 130) | 1968 Apr 13 (Saros 131) | |||
 |  |  |  |  |  |
| 1997 Mar 24 (Saros 132) | 2026 Mar 03 (Saros 133) | 2055 Feb 11 (Saros 134) | |||
 |  |  |  | | |
| 2084 Jan 22 (Saros 135) | 2113 Jan 02 (Saros 136) | 2141 Dec 13 (Saros 137) | |||
 |  | ||||
| 2170 Nov 23 (Saros 138) | 2199 Nov 02 (Saros 139) | ||||
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 141.
| February 5, 2046 | February 17, 2064 |
|---|---|
 |  |
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