# December 2011 lunar eclipse

A total lunar eclipse occurred at the Moon’s descending node of orbit on Saturday, December 10, 2011, with an umbral magnitude of 1.1076. A lunar eclipse occurs when the Moon moves into the Earth'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 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. 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's shadow is smaller. Occurring about 4.8 days after apogee (on December 5, 2011, at 20:10 UTC), the Moon's apparent diameter was smaller.

## Visibility

The eclipse was completely visible over east and northern Asia, Australia, and northern North America, seen rising over Europe and east and central Africa, and setting over North America.
| | Hourly motion shown right to left | The Moon's hourly motion across the Earth's shadow in the constellation of Taurus. |
| Visibility map |||

## Gallery

Asia
* Seoul, South Korea
* Japan
* Japan
* Tokyo, Japan Wide view with Orion
* Beijing, China
* Laguna, Philippines, 13:49 UTC
* Bangkok, Thailand, 12:46-13:57 UTC
* Singapore, 14:10 UTC
* Lam Tin, Hong Kong, 14:47 UTC
* Batticaloa, Sri Lanka, 15:07 UTC
* Rawalpindi, Pakistan
* New Delhi, India
* Mumbai, India
* Japan
Australia and Oceania
Europe and Middle East
* End of Lunar Eclipse from the Netherlands, 12 images merged
* Modi'in, Israel.
North America
* Peninsular Ranges of Southern California, just before moonset.
* Minneapolis, Minnesota, 13:05 UTC
* Loveland, Colorado, 13:49 UTC
* Medford, Oregon, 14:34 UTC
* Madison, Wisconsin

## Timing
### Times for Australia

The eclipse occurred on Saturday evening in Australia. Eastern Daylight Saving Time: (+11:00 UTC)
* Penumbral Eclipse Begins: 22:33:32 EDST
* Partial Eclipse Begins: 23:45:42 EDST
* Total Eclipse Begins: 01:06:16 EDST
* Greatest Eclipse: 01:31:49 EDST
* Total Eclipse Ends: 01:57:24 EDST
* Partial Eclipse Ends: 03:17:58 EDST
* Penumbral Eclipse Ends: 04:30:00 EDST

### Times for India

The eclipse was visible from India in the evening, given in India Standard Time (UTC+5:30):
* Penumbral eclipse begins (P1): 17:04 IST
* Partial eclipse begins (U1): 18:16 IST
* Total eclipse begins (U2): 19:36 IST
* Mid-eclipse: 20:02 IST
* Total eclipse ends (U3): 20:27 IST
* Partial eclipse ends (U4): 21:48 IST
* Penumbral eclipse ends (P4): 23:00 IST

### Times for North America

The eclipse was visible on Saturday morning before sunrise over North America. For most location the moon set before full lunar eclipse. Only Alaska and northernmost Canada will be able to witness the entire event.
| Contact | North America | North America | North America | North America | North America | UTC |
| Contact | AST (UTC−9) | PST (UTC−8) | MST (UTC−7) | CST (UTC−6) | EST (UTC−5) | UTC |
| Penumbral begins (P1) | 2:34 am | 3:34 am | 4:34 am | 5:34 am | 6:34 am | 11:34 |
| Partial begins (U1) | 3:46 am | 4:46 am | 5:46 am | 6:46 am | 7:46 am | 12:46 |
| Totality begins (U2) | 5:06 am | 6:06 am | 7:06 am | 8:06 am | 9:06 am | 14:06 |
| Mid-eclipse | 5:32 am | 6:32 am | 7:32 am | 8:32 am | 9:32 am | 14:32 |
| Totality ends (U3) | 5:57 am | 6:57 am | 7:57 am | 8:57 am | 9:57 am | 14:57 |
| Partial ends (U4) | 7:18 am | 8:18 am | 9:18 am | 10:18 am | 11:18 am | 16:18 |
| Penumbral ends (P4) | 8:30 am | 9:30 am | 10:30 am | 11:30 am | 12:30 pm | 17:30 |
| (Table entries are given a dark background for invisibility due to moonset) |||||||

## Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
December 10, 2011 Lunar Eclipse Parameters :
| Parameter | Value |
| Penumbral Magnitude | 2.18746 |
| Umbral Magnitude | 1.10757 |
| Gamma | −0.38819 |
| Sun Right Ascension | 17h08m35.0s |
| Sun Declination | -22°54'38.7" |
| Sun Semi-Diameter | 16'14.5" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 05h08m33.9s |
| Moon Declination | +22°33'13.3" |
| Moon Semi-Diameter | 15'02.4" |
| Moon Equatorial Horizontal Parallax | 0°55'11.7" |
| ΔT | 66.7 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.
Eclipse season of November–December 2011 :
| November 25 Ascending node (new moon) | December 10 Descending node (full moon) |
| Partial solar eclipse Solar Saros 123 | Total lunar eclipse Lunar Saros 135 |

## Related eclipses
### Eclipses in 2011

* A partial solar eclipse on January 4.
* A partial solar eclipse on June 1.
* A total lunar eclipse on June 15.
* A partial solar eclipse on July 1.
* A partial solar eclipse on November 25.
* A total lunar eclipse on December 10.

### Metonic

* Preceded by: Lunar eclipse of February 21, 2008
* Followed by: Lunar eclipse of September 28, 2015

### Tzolkinex

* Preceded by: Lunar eclipse of October 28, 2004
* Followed by: Lunar eclipse of January 21, 2019

### Half-Saros

* Preceded by: Solar eclipse of December 4, 2002
* Followed by: Solar eclipse of December 14, 2020

### Tritos

* Preceded by: Lunar eclipse of January 9, 2001
* Followed by: Lunar eclipse of November 8, 2022

### Lunar Saros 135

* Preceded by: Lunar eclipse of November 29, 1993
* Followed by: Lunar eclipse of December 20, 2029

### Inex

* Preceded by: Lunar eclipse of December 30, 1982
* Followed by: Lunar eclipse of November 18, 2040

### Triad

* Preceded by: Lunar eclipse of February 8, 1925
* Followed by: Lunar eclipse of October 10, 2098

### Lunar eclipses of 2009–2013

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 eclipses on February 9, 2009 and August 6, 2009 occur in the previous lunar year eclipse set, and the lunar eclipses on April 25, 2013 (partial) and October 18, 2013 (penumbral) occur in the next lunar year eclipse set.
Lunar eclipse series sets from 2009 to 2013 :
| Ascending node | Ascending node | Ascending node | Ascending node | Descending node | Descending node | Descending node | Descending node |
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma |
| 110 | 2009 Jul 07 | Penumbral | −1.4916 | 115 | 2009 Dec 31 | Partial | 0.9766 |
| 120 | 2010 Jun 26 | Partial | −0.7091 | 125 | 2010 Dec 21 | Total | 0.3214 |
| 130 | 2011 Jun 15 | Total | 0.0897 | 135 | 2011 Dec 10 | Total | −0.3882 |
| 140 | 2012 Jun 04 | Partial | 0.8248 | 145 | 2012 Nov 28 | Penumbral | −1.0869 |
| 150 | 2013 May 25 | Penumbral | 1.5351 |

### Saros 135

This eclipse is a part of Saros series 135, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on April 13, 1615. It contains partial eclipses from July 20, 1777 through October 28, 1939; total eclipses from November 7, 1957 through July 6, 2354; and a second set of partial eclipses from July 16, 2372 through September 19, 2480. The series ends at member 71 as a penumbral eclipse on May 18, 2877.
The longest duration of totality will be produced by member 37 at 106 minutes, 13 seconds on May 12, 2264. All eclipses in this series occur at the Moon’s descending node of orbit.
| Greatest | First | First | First | First |
| The greatest eclipse of the series will occur on 2264 May 12, lasting 106 minutes, 13 seconds. | Penumbral | Partial | Total | Central |
| The greatest eclipse of the series will occur on 2264 May 12, lasting 106 minutes, 13 seconds. | 1615 Apr 13 | 1777 Jul 20 | 1957 Nov 07 | 2174 Mar 18 |
| Last ||||
| The greatest eclipse of the series will occur on 2264 May 12, lasting 106 minutes, 13 seconds. | Central | Total | Partial | Penumbral |
| The greatest eclipse of the series will occur on 2264 May 12, lasting 106 minutes, 13 seconds. | 2318 Jun 14 | 2354 Jul 06 | 2480 Sep 19 | 2877 May 18 |
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 12–33 occur between 1801 and 2200: :
| 12 | 12 | 13 | 13 | 14 | 14 |
| 1813 Aug 12 | 1813 Aug 12 | 1831 Aug 23 | 1831 Aug 23 | 1849 Sep 02 | 1849 Sep 02 |
| 15 | 15 | 16 | 16 | 17 | 17 |
| 1867 Sep 14 | 1867 Sep 14 | 1885 Sep 24 | 1885 Sep 24 | 1903 Oct 06 | 1903 Oct 06 |
| 18 | 18 | 19 | 19 | 20 | 20 |
| 1921 Oct 16 | 1921 Oct 16 | 1939 Oct 28 | 1939 Oct 28 | 1957 Nov 07 | 1957 Nov 07 |
| 21 | 21 | 22 | 22 | 23 | 23 |
| 1975 Nov 18 | 1975 Nov 18 | 1993 Nov 29 | 1993 Nov 29 | 2011 Dec 10 | 2011 Dec 10 |
| 24 | 24 | 25 | 25 | 26 | 26 |
| 2029 Dec 20 | 2029 Dec 20 | 2048 Jan 01 | 2048 Jan 01 | 2066 Jan 11 | 2066 Jan 11 |
| 27 | 27 | 28 | 28 | 29 | 29 |
| 2084 Jan 22 | 2084 Jan 22 | 2102 Feb 03 | 2102 Feb 03 | 2120 Feb 14 | 2120 Feb 14 |
| 30 | 30 | 31 | 31 | 32 | 32 |
| 2138 Feb 24 | 2138 Feb 24 | 2156 Mar 07 | 2156 Mar 07 | 2174 Mar 18 | 2174 Mar 18 |
| 33 ||
| 2192 Mar 28 ||

### 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 2200 :
| 1804 Jul 22 (Saros 116) | 1804 Jul 22 (Saros 116) | 1815 Jun 21 (Saros 117) | 1815 Jun 21 (Saros 117) | 1826 May 21 (Saros 118) | 1826 May 21 (Saros 118) | 1837 Apr 20 (Saros 119) | 1837 Apr 20 (Saros 119) | 1848 Mar 19 (Saros 120) | 1848 Mar 19 (Saros 120) |
| 1859 Feb 17 (Saros 121) | 1859 Feb 17 (Saros 121) | 1870 Jan 17 (Saros 122) | 1870 Jan 17 (Saros 122) | 1880 Dec 16 (Saros 123) | 1880 Dec 16 (Saros 123) | 1891 Nov 16 (Saros 124) | 1891 Nov 16 (Saros 124) | 1902 Oct 17 (Saros 125) | 1902 Oct 17 (Saros 125) |
| 1913 Sep 15 (Saros 126) | 1913 Sep 15 (Saros 126) | 1924 Aug 14 (Saros 127) | 1924 Aug 14 (Saros 127) | 1935 Jul 16 (Saros 128) | 1935 Jul 16 (Saros 128) | 1946 Jun 14 (Saros 129) | 1946 Jun 14 (Saros 129) | 1957 May 13 (Saros 130) | 1957 May 13 (Saros 130) |
| 1968 Apr 13 (Saros 131) | 1968 Apr 13 (Saros 131) | 1979 Mar 13 (Saros 132) | 1979 Mar 13 (Saros 132) | 1990 Feb 09 (Saros 133) | 1990 Feb 09 (Saros 133) | 2001 Jan 09 (Saros 134) | 2001 Jan 09 (Saros 134) | 2011 Dec 10 (Saros 135) | 2011 Dec 10 (Saros 135) |
| 2022 Nov 08 (Saros 136) | 2022 Nov 08 (Saros 136) | 2033 Oct 08 (Saros 137) | 2033 Oct 08 (Saros 137) | 2044 Sep 07 (Saros 138) | 2044 Sep 07 (Saros 138) | 2055 Aug 07 (Saros 139) | 2055 Aug 07 (Saros 139) | 2066 Jul 07 (Saros 140) | 2066 Jul 07 (Saros 140) |
| 2077 Jun 06 (Saros 141) | 2077 Jun 06 (Saros 141) | 2088 May 05 (Saros 142) | 2088 May 05 (Saros 142) | 2099 Apr 05 (Saros 143) | 2099 Apr 05 (Saros 143) | 2110 Mar 06 (Saros 144) | 2110 Mar 06 (Saros 144) | 2121 Feb 02 (Saros 145) | 2121 Feb 02 (Saros 145) |
| 2132 Jan 02 (Saros 146) | 2132 Jan 02 (Saros 146) | 2142 Dec 03 (Saros 147) | 2142 Dec 03 (Saros 147) | 2153 Nov 01 (Saros 148) | 2153 Nov 01 (Saros 148) | 2164 Sep 30 (Saros 149) | 2164 Sep 30 (Saros 149) | 2175 Aug 31 (Saros 150) | 2175 Aug 31 (Saros 150) |
| 2186 Jul 31 (Saros 151) | 2186 Jul 31 (Saros 151) | 2197 Jun 29 (Saros 152) | 2197 Jun 29 (Saros 152) |

### 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 :
| 1809 Apr 30 (Saros 128) | 1809 Apr 30 (Saros 128) | 1838 Apr 10 (Saros 129) | 1838 Apr 10 (Saros 129) | 1867 Mar 20 (Saros 130) | 1867 Mar 20 (Saros 130) |
| 1896 Feb 28 (Saros 131) | 1896 Feb 28 (Saros 131) | 1925 Feb 08 (Saros 132) | 1925 Feb 08 (Saros 132) | 1954 Jan 19 (Saros 133) | 1954 Jan 19 (Saros 133) |
| 1982 Dec 30 (Saros 134) | 1982 Dec 30 (Saros 134) | 2011 Dec 10 (Saros 135) | 2011 Dec 10 (Saros 135) | 2040 Nov 18 (Saros 136) | 2040 Nov 18 (Saros 136) |
| 2069 Oct 30 (Saros 137) | 2069 Oct 30 (Saros 137) | 2098 Oct 10 (Saros 138) | 2098 Oct 10 (Saros 138) | 2127 Sep 20 (Saros 139) | 2127 Sep 20 (Saros 139) |
| 2156 Aug 30 (Saros 140) | 2156 Aug 30 (Saros 140) | 2185 Aug 11 (Saros 141) | 2185 Aug 11 (Saros 141) |

### 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 total solar eclipses of Solar Saros 142.
| December 4, 2002 | December 14, 2020 |