Solar eclipse of December 4, 2021
Template:Short description Script error: No such module "Solar eclipse". A total solar eclipse occurred at the Moon’s descending node of orbit on Saturday, December 4, 2021,[1][2][3][4] with a magnitude of 1.0367. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's and the apparent path of the Sun and Moon intersect, blocking all direct sunlight and turning daylight into darkness; the Sun appears to be black with a halo around it. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 2.5 hours before perigee (on December 4, 2021, at 10:00 UTC), the Moon's apparent diameter was larger.[5]
This eclipse was unusual as the path of the total eclipse moved from east to west across West Antarctica, while most eclipse paths move from west to east. This reversal is only possible in polar regions. Its path across Antarctica crossed near Berkner Island, traversed an arc over the continent and passed over Shepard Island.[6][7] A partial eclipse was visible for parts of Southern Africa, Antarctica, and Tasmania.
Images
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Animated path
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NASA's DSCOVR Satellite photo
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As observed by the Royal Navy (HMS Protector) off South Georgia
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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.[8]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 2021 December 4 at 05:30:26.5 UTC |
| First Umbral External Contact | 2021 December 4 at 07:01:16.7 UTC |
| First Central Line | 2021 December 4 at 07:04:03.2 UTC |
| First Umbral Internal Contact | 2021 December 4 at 07:07:04.8 UTC |
| Greatest Eclipse | 2021 December 4 at 07:34:37.9 UTC |
| Greatest Duration | 2021 December 4 at 07:34:40.1 UTC |
| Ecliptic Conjunction | 2021 December 4 at 07:44:11.1 UTC |
| Equatorial Conjunction | 2021 December 4 at 07:57:20.3 UTC |
| Last Umbral Internal Contact | 2021 December 4 at 08:01:55.8 UTC |
| Last Central Line | 2021 December 4 at 08:04:57.6 UTC |
| Last Umbral External Contact | 2021 December 4 at 08:07:44.3 UTC |
| Last Penumbral External Contact | 2021 December 4 at 09:38:39.3 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 1.03673 |
| Eclipse Obscuration | 1.07481 |
| Gamma | −0.95261 |
| Sun Right Ascension | 16h43m32.4s |
| Sun Declination | -22°16'29.4" |
| Sun Semi-Diameter | 16'13.6" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 16h42m35.0s |
| Moon Declination | -23°13'22.3" |
| Moon Semi-Diameter | 16'44.7" |
| Moon Equatorial Horizontal Parallax | 1°01'27.3" |
| ΔT | 70.6 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.
| November 19 Ascending node (full moon) |
December 4 Descending node (new moon) |
|---|---|
| File:Lunar eclipse chart close-2021Nov19.png | File:SE2021Dec04T.png |
| Partial lunar eclipse Lunar Saros 126 |
Total solar eclipse Solar Saros 152 |
Related eclipses
Eclipses in 2021
- A total lunar eclipse on May 26.[9]
- An annular solar eclipse on June 10.
- A partial lunar eclipse on November 19.
- A total solar eclipse on December 4.
Metonic
- Preceded by: Solar eclipse of February 15, 2018
- Followed by: Solar eclipse of September 21, 2025
Tzolkinex
- Preceded by: Solar eclipse of October 23, 2014
- Followed by: Solar eclipse of January 14, 2029
Half-Saros
- Preceded by: Lunar eclipse of November 28, 2012
- Followed by: Lunar eclipse of December 9, 2030
Tritos
- Preceded by: Solar eclipse of January 4, 2011
- Followed by: Solar eclipse of November 3, 2032
Solar Saros 152
- Preceded by: Solar eclipse of November 23, 2003
- Followed by: Solar eclipse of December 15, 2039
Inex
- Preceded by: Solar eclipse of December 24, 1992
- Followed by: Solar eclipse of November 14, 2050
Triad
- Preceded by: Solar eclipse of February 3, 1935
- Followed by: Solar eclipse of October 5, 2108
Solar eclipses of 2018–2021
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.[10]
The partial solar eclipses on February 15, 2018 and August 11, 2018 occur in the previous lunar year eclipse set.
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Saros 152
Template:Solar Saros series 152
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 July 11, 1953 and July 11, 2029 | ||||
|---|---|---|---|---|
| July 10–11 | April 29–30 | February 15–16 | December 4 | September 21–23 |
| 116 | 118 | 120 | 122 | 124 |
| File:SE1953Jul11P.png July 11, 1953 |
File:SE1957Apr30A.png April 30, 1957 |
File:SE1961Feb15T.png February 15, 1961 |
File:SE1964Dec04P.png December 4, 1964 |
File:SE1968Sep22T.png September 22, 1968 |
| 126 | 128 | 130 | 132 | 134 |
| File:SE1972Jul10T.png July 10, 1972 |
File:SE1976Apr29A.png April 29, 1976 |
File:SE1980Feb16T.png February 16, 1980 |
File:SE1983Dec04A.png December 4, 1983 |
File:SE1987Sep23A.png September 23, 1987 |
| 136 | 138 | 140 | 142 | 144 |
| File:SE1991Jul11T.png July 11, 1991 |
File:SE1995Apr29A.png April 29, 1995 |
File:SE1999Feb16A.png February 16, 1999 |
File:SE2002Dec04T.png December 4, 2002 |
File:SE2006Sep22A.png September 22, 2006 |
| 146 | 148 | 150 | 152 | 154 |
| File:SE2010Jul11T.png July 11, 2010 |
File:SE2014Apr29A.png April 29, 2014 |
File:SE2018Feb15P.png February 15, 2018 |
File:SE2021Dec04T.png December 4, 2021 |
File:SE2025Sep21P.png September 21, 2025 |
| 156 | ||||
| File:SE2029Jul11P.png July 11, 2029 | ||||
Tritos series
Template:Solar Tritos series 2000 February 5
Inex series
Template:Solar Inex series 2021 December 4
Notes
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References
- solar-eclipse.de: The total solar eclipse of 12/04/2021
- Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
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