Solar eclipse of January 4, 1973
Template:Short description Script error: No such module "Solar eclipse". An annular solar eclipse occurred at the Moon's ascending node of orbit on Thursday, January 4, 1973,[1] with a magnitude of 0.9303. 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 wide. Occurring about 3.75 days after apogee (on December 31, 1972, at 21:50 UTC), the Moon's apparent diameter was smaller.[2]
Annularity was visible from Chile and Argentina. A partial eclipse was visible for parts of southern and central South America, Antarctica, West Africa, and Southern Africa.
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.[3]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1973 January 4 at 12:44:40.6 UTC |
| First Umbral External Contact | 1973 January 4 at 13:50:14.3 UTC |
| First Central Line | 1973 January 4 at 13:53:17.7 UTC |
| First Umbral Internal Contact | 1973 January 4 at 13:56:21.3 UTC |
| First Penumbral Internal Contact | 1973 January 4 at 15:07:01.4 UTC |
| Greatest Duration | 1973 January 4 at 15:35:51.4 UTC |
| Equatorial Conjunction | 1973 January 4 at 15:39:50.9 UTC |
| Ecliptic Conjunction | 1973 January 4 at 15:43:12.3 UTC |
| Greatest Eclipse | 1973 January 4 at 15:46:20.7 UTC |
| Last Penumbral Internal Contact | 1973 January 4 at 16:25:50.8 UTC |
| Last Umbral Internal Contact | 1973 January 4 at 17:36:25.9 UTC |
| Last Central Line | 1973 January 4 at 17:39:27.4 UTC |
| Last Umbral External Contact | 1973 January 4 at 17:42:28.4 UTC |
| Last Penumbral External Contact | 1973 January 4 at 18:47:58.6 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.93032 |
| Eclipse Obscuration | 0.86549 |
| Gamma | −0.26441 |
| Sun Right Ascension | 19h01m31.4s |
| Sun Declination | -22°41'24.6" |
| Sun Semi-Diameter | 16'15.9" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 19h01m44.3s |
| Moon Declination | -22°55'32.0" |
| Moon Semi-Diameter | 14'54.7" |
| Moon Equatorial Horizontal Parallax | 0°54'43.6" |
| ΔT | 43.4 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.
| January 4 Ascending node (new moon) |
January 18 Descending node (full moon) |
|---|---|
| File:SE1973Jan04A.png | File:Lunar eclipse chart close-1973Jan18.png |
| Annular solar eclipse Solar Saros 131 |
Penumbral lunar eclipse Lunar Saros 143 |
Related eclipses
Eclipses in 1973
- An annular solar eclipse on January 4.
- A penumbral lunar eclipse on January 18.
- A penumbral lunar eclipse on June 15.
- A total solar eclipse on June 30.
- A penumbral lunar eclipse on July 15.
- A partial lunar eclipse on December 10.
- An annular solar eclipse on December 24.
Metonic
- Preceded by: Solar eclipse of March 18, 1969
- Followed by: Solar eclipse of October 23, 1976
Tzolkinex
- Preceded by: Solar eclipse of November 23, 1965
- Followed by: Solar eclipse of February 16, 1980
Half-Saros
- Preceded by: Lunar eclipse of December 30, 1963
- Followed by: Lunar eclipse of January 9, 1982
Tritos
- Preceded by: Solar eclipse of February 5, 1962
- Followed by: Solar eclipse of December 4, 1983
Solar Saros 131
- Preceded by: Solar eclipse of December 25, 1954
- Followed by: Solar eclipse of January 15, 1991
Inex
- Preceded by: Solar eclipse of January 25, 1944
- Followed by: Solar eclipse of December 14, 2001
Triad
- Preceded by: Solar eclipse of March 5, 1886
- Followed by: Solar eclipse of November 5, 2059
Solar eclipses of 1971–1974
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.[4]
The partial solar eclipses on February 25, 1971 and August 20, 1971 occur in the previous lunar year eclipse set.
| Solar eclipse series sets from 1971 to 1974 | ||||||
|---|---|---|---|---|---|---|
| Descending node | Ascending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 116 | July 22, 1971 File:SE1971Jul22P.png Partial |
1.513 | 121 | January 16, 1972 File:SE1972Jan16A.png Annular |
−0.9365 | |
| 126 | July 10, 1972 File:SE1972Jul10T.png Total |
0.6872 | 131 | January 4, 1973 File:SE1973Jan04A.png Annular |
−0.2644 | |
| 136 | June 30, 1973 File:SE1973Jun30T.png Total |
−0.0785 | 141 | December 24, 1973 File:SE1973Dec24A.png Annular |
0.4171 | |
| 146 | June 20, 1974 File:SE1974Jun20T.png Total |
−0.8239 | 151 | December 13, 1974 File:SE1974Dec13P.png Partial |
1.0797 | |
Saros 131
This eclipse is a part of Saros series 131, repeating every 18 years, 11 days, and containing 70 events. The series started with a partial solar eclipse on August 1, 1125. It contains total eclipses from March 27, 1522 through May 30, 1612; hybrid eclipses from June 10, 1630 through July 24, 1702; and annular eclipses from August 4, 1720 through June 18, 2243. The series ends at member 70 as a partial eclipse on September 2, 2369. 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 28 at 58 seconds on May 30, 1612, and the longest duration of annularity was produced by member 50 at 7 minutes, 54 seconds on January 26, 2009. All eclipses in this series occur at the Moon’s ascending node of orbit.[5]
| Series members 39–60 occur between 1801 and 2200: | ||
|---|---|---|
| 39 | 40 | 41 |
| File:SE1810Sep28A.png September 28, 1810 |
File:SE1828Oct09A.png October 9, 1828 |
File:SE1846Oct20A.png October 20, 1846 |
| 42 | 43 | 44 |
| File:SE1864Oct30A.png October 30, 1864 |
File:SE1882Nov10A.png November 10, 1882 |
File:SE1900Nov22A.png November 22, 1900 |
| 45 | 46 | 47 |
| File:SE1918Dec03A.png December 3, 1918 |
File:SE1936Dec13A.png December 13, 1936 |
File:SE1954Dec25A.png December 25, 1954 |
| 48 | 49 | 50 |
| File:SE1973Jan04A.png January 4, 1973 |
File:SE1991Jan15A.png January 15, 1991 |
File:SE2009Jan26A.png January 26, 2009 |
| 51 | 52 | 53 |
| File:SE2027Feb06A.png February 6, 2027 |
File:SE2045Feb16A.png February 16, 2045 |
File:SE2063Feb28A.png February 28, 2063 |
| 54 | 55 | 56 |
| File:SE2081Mar10A.png March 10, 2081 |
File:SE2099Mar21A.png March 21, 2099 |
File:SE2117Apr02A.png April 2, 2117 |
| 57 | 58 | 59 |
| File:SE2135Apr13A.png April 13, 2135 |
File:SE2153Apr23A.png April 23, 2153 |
File:SE2171May05A.png May 5, 2171 |
| 60 | ||
| File:SE2189May15A.png May 15, 2189 | ||
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 ascending node.
Tritos series
Template:Solar Tritos series 2005 October 3
Inex series
Template:Solar Inex series 2001 December 14
Notess
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References
- Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
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