Solar eclipse of May 20, 2012
Template:Short description Template:Good article Script error: No such module "Solar eclipse". An annular solar eclipse occurred at the Moon’s descending node of orbit between Sunday, May 20 and Monday, May 21, 2012,[1][2][3] with a magnitude of 0.9439. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres or miles wide. Occurring about 1.3 days after apogee (on May 19, 2012, at 17:10 UTC), the Moon's apparent diameter was smaller.[4]
The annular eclipse was the first visible from the contiguous United States since the solar eclipse of May 10, 1994 (Saros 128), and the first in Asia since the solar eclipse of January 15, 2010 (Saros 141).[5] The path of the eclipse's antumbra included heavily populated regions of China and Japan, and an estimated 100 million people in those areas were capable of viewing annularity. In the western United States, its path included 8 states, and an estimated 6 million people were capable of viewing annularity.
The eclipse was visible in a band spanning through East Asia, the Pacific Ocean, and North America. As a partial solar eclipse, it was visible from Greenland to Hawaii, and from eastern Indonesia at sunrise to western North America at sunset.
Visibility and viewing
The antumbra had a magnitude of .94, stretched Script error: No such module "convert". wide, and traveled eastbound at an average rate of Script error: No such module "convert". per second, remaining north of the equator throughout the event. The longest duration of annularity was 5 minutes and 46 seconds, occurring just south of the Aleutian Islands.[6] The eclipse began on a Monday and ended on the previous Sunday, as it crossed the International Date Line.[5]
Asia
The annular eclipse commenced over the Chinese province of Guangxi at sunrise, at 6:06 a.m. China Standard Time. Travelling northeast, the antumbra of the eclipse approached and passed over the cities of Macau, Hong Kong, Guangzhou, and Xiamen, reaching Taipei by 6:10 a.m NST. After crossing the East China Sea, it passed over much of eastern Japan, including Osaka and Tokyo at 7:28 a.m and 7:32 a.m JST respectively, before entering the Pacific Ocean. The penumbra of the eclipse was visible throughout Eastern Asia and various islands in the Pacific Ocean until noon.[7][8]
The path of the antumbra over highly populated areas allowed at least an estimated 100 million people to view annularity.[9] Because the eclipse took place during the summer monsoon season in Southeast Asia, viewing conditions were not ideal in some areas, including Hong Kong.[10]
North America
After traveling approximately 4,000 miles (6,500 kilometers) across the Pacific Ocean, the antumbra entered North America between the coastlines of Oregon and California, reaching the coastal city of Eureka, California at 6:25 p.m PDT. After passing over Medford, Oregon and Redding, California, it had reached Reno, Nevada by 6:28 p.m PDT. The eclipse continued to travel southeast, passing 30 miles (48 km) north of Las Vegas, Nevada, over St. George, Utah, and reaching the Grand Canyon by approximately 6:33 p.m MST. After passing over Albuquerque, New Mexico and Lubbock, Texas, the eclipse terminated above central Texas at sunset, 8:38 p.m. CST.[7][6][11] An estimated 6.6 million people lived under the path of the antumbra.[12] The penumbra was visible throughout most of North America, including the islands of Hawaii.[6]
Eclipse details
Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[13]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 2012 May 20 at 20:57:13.9 UTC |
| First Umbral External Contact | 2012 May 20 at 22:07:23.9 UTC |
| First Central Line | 2012 May 20 at 22:10:08.2 UTC |
| First Umbral Internal Contact | 2012 May 20 at 22:12:53.7 UTC |
| Ecliptic Conjunction | 2012 May 20 at 23:48:08.1 UTC |
| Greatest Eclipse | 2012 May 20 at 23:53:53.6 UTC |
| Greatest Duration | 2012 May 20 at 23:56:59.8 UTC |
| Equatorial Conjunction | 2012 May 21 at 00:00:16.3 UTC |
| Last Umbral Internal Contact | 2012 May 21 at 01:34:49.7 UTC |
| Last Central Line | 2012 May 21 at 01:37:34.4 UTC |
| Last Umbral External Contact | 2012 May 21 at 01:40:18.0 UTC |
| Last Penumbral External Contact | 2012 May 21 at 02:50:28.7 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.94390 |
| Eclipse Obscuration | 0.89094 |
| Gamma | 0.48279 |
| Sun Right Ascension | 03h52m43.0s |
| Sun Declination | +20°13'15.1" |
| Sun Semi-Diameter | 15'48.1" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 03h52m30.7s |
| Moon Declination | +20°39'06.3" |
| Moon Semi-Diameter | 14'43.3" |
| Moon Equatorial Horizontal Parallax | 0°54'01.7" |
| ΔT | 66.7 s |
Eclipse season
Script error: No such module "Labelled list hatnote". 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.
| May 20 Descending node (new moon) |
June 4 Ascending node (full moon) |
|---|---|
| File:SE2012May20A.png | File:Lunar eclipse chart close-2012Jun04.png |
| Annular solar eclipse Solar Saros 128 |
Partial lunar eclipse Lunar Saros 140 |
Related eclipses
Eclipses in 2012
- An annular solar eclipse on May 20.
- A partial lunar eclipse on June 4.
- A total solar eclipse on November 13.
- A penumbral lunar eclipse on November 28.
Metonic
- Preceded by: Solar eclipse of August 1, 2008
- Followed by: Solar eclipse of March 9, 2016
Tzolkinex
- Preceded by: Solar eclipse of April 8, 2005
- Followed by: Solar eclipse of July 2, 2019
Half-Saros
- Preceded by: Lunar eclipse of May 16, 2003
- Followed by: Lunar eclipse of May 26, 2021
Tritos
- Preceded by: Solar eclipse of June 21, 2001
- Followed by: Solar eclipse of April 20, 2023
Solar Saros 128
- Preceded by: Solar eclipse of May 10, 1994
- Followed by: Solar eclipse of June 1, 2030
Inex
- Preceded by: Solar eclipse of June 11, 1983
- Followed by: Solar eclipse of April 30, 2041
Triad
- Preceded by: Solar eclipse of July 20, 1925
- Followed by: Solar eclipse of March 21, 2099
Solar eclipses of 2011–2014
This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[14]
The partial solar eclipses on January 4, 2011 and July 1, 2011 occur in the previous lunar year eclipse set.
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Saros 128
This eclipse is a part of Saros series 128, repeating every 18 years, 11 days, and containing 73 events. The series started with a partial solar eclipse on August 29, 984 AD. It contains total eclipses from May 16, 1417 through June 18, 1471; hybrid eclipses from June 28, 1489 through July 31, 1543; and annular eclipses from August 11, 1561 through July 25, 2120. The series ends at member 73 as a partial eclipse on November 1, 2282. Its 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.
The longest duration of totality was produced by member 27 at 1 minutes, 45 seconds on June 7, 1453, and the longest duration of annularity was produced by member 48 at 8 minutes, 35 seconds on February 1, 1832. All eclipses in this series occur at the Moon’s descending node of orbit.[15]
| Series members 47–68 occur between 1801 and 2200: | ||
|---|---|---|
| 47 | 48 | 49 |
| File:SE1814Jan21A.gif January 21, 1814 |
File:SE1832Feb01A.gif February 1, 1832 |
File:SE1850Feb12A.gif February 12, 1850 |
| 50 | 51 | 52 |
| File:SE1868Feb23A.gif February 23, 1868 |
File:SE1886Mar05A.gif March 5, 1886 |
File:SE1904Mar17A.png March 17, 1904 |
| 53 | 54 | 55 |
| File:SE1922Mar28A.png March 28, 1922 |
File:SE1940Apr07A.png April 7, 1940 |
File:SE1958Apr19A.png April 19, 1958 |
| 56 | 57 | 58 |
| File:SE1976Apr29A.png April 29, 1976 |
File:SE1994May10A.png May 10, 1994 |
File:SE2012May20A.png May 20, 2012 |
| 59 | 60 | 61 |
| File:SE2030Jun01A.png June 1, 2030 |
File:SE2048Jun11A.png June 11, 2048 |
File:SE2066Jun22A.png June 22, 2066 |
| 62 | 63 | 64 |
| File:SE2084Jul03A.png July 3, 2084 |
File:SE2102Jul15A.png July 15, 2102 |
File:SE2120Jul25A.png July 25, 2120 |
| 65 | 66 | 67 |
| File:Saros128 65van73 SE2138Aug05P.jpg August 5, 2138 |
File:Saros128 66van73 SE2156Aug16P.jpg August 16, 2156 |
File:Saros128 67van73 SE2174Aug27P.jpg August 27, 2174 |
| 68 | ||
| File:Saros128 68van73 SE2192Sep06P.jpg September 6, 2192 | ||
Metonic series
The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's descending node.
| 21 eclipse events between May 21, 1993 and May 20, 2069 | ||||
|---|---|---|---|---|
| May 20–21 | March 9 | December 25–26 | October 13–14 | August 1–2 |
| 118 | 120 | 122 | 124 | 126 |
| File:SE1993May21P.png May 21, 1993 |
File:SE1997Mar09T.png March 9, 1997 |
File:SE2000Dec25P.png December 25, 2000 |
File:SE2004Oct14P.png October 14, 2004 |
File:SE2008Aug01T.png August 1, 2008 |
| 128 | 130 | 132 | 134 | 136 |
| File:SE2012May20A.png May 20, 2012 |
File:SE2016Mar09T.png March 9, 2016 |
File:SE2019Dec26A.png December 26, 2019 |
File:SE2023Oct14A.png October 14, 2023 |
File:SE2027Aug02T.png August 2, 2027 |
| 138 | 140 | 142 | 144 | 146 |
| File:SE2031May21A.png May 21, 2031 |
File:SE2035Mar09A.png March 9, 2035 |
File:SE2038Dec26T.png December 26, 2038 |
File:SE2042Oct14A.png October 14, 2042 |
File:SE2046Aug02T.png August 2, 2046 |
| 148 | 150 | 152 | 154 | 156 |
| File:SE2050May20H.png May 20, 2050 |
File:SE2054Mar09P.png March 9, 2054 |
File:SE2057Dec26T.png December 26, 2057 |
File:SE2061Oct13A.png October 13, 2061 |
File:SE2065Aug02P.png August 2, 2065 |
| 158 | ||||
| File:SE2069May20P.png May 20, 2069 | ||||
Tritos series
Template:Solar Tritos series 2001 June 21
Inex series
Template:Solar Inex series 2012 May 20
Notes
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References
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