Solar eclipse of July 20, 1982

20th-century partial solar eclipse

Solar eclipse of July 20, 1982

Map

Type of eclipse
Nature| Partial
Gamma| 1.2886
Magnitude| 0.4643
Maximum eclipse
Coordinates| 68°36′N 64°12′E﻿ / ﻿68.6°N 64.2°E﻿ / 68.6; 64.2
Times (UTC)
Greatest eclipse| 18:44:44
References
Saros| 155 (4 of 71)
Catalog # (SE5000)| 9469

A partial solar eclipse occurred at the Moon's ascending node of orbit on Tuesday, July 20, 1982,[1] with a magnitude of 0.4643. 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. A partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.

This was the third of four partial solar eclipses in 1982, with the others occurring on January 25, June 21, and December 15.

A partial eclipse was visible for parts of the northern Soviet Union, northern Alaska, northern Canada, Greenland, and Northern Europe.

## Eclipse details

[edit]

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.[2]

July 20, 1982 Solar Eclipse Times  Event  | Time (UTC)

|

First Penumbral External Contact  | 1982 July 20 at 17:19:36.7 UTC
Equatorial Conjunction  | 1982 July 20 at 18:30:56.4 UTC
Greatest Eclipse  | 1982 July 20 at 18:44:43.8 UTC
Ecliptic Conjunction  | 1982 July 20 at 18:57:30.7 UTC
Last Penumbral External Contact  | 1982 July 20 at 20:09:59.1 UTC
July 20, 1982 Solar Eclipse Parameters  Parameter  | Value

|

Eclipse Magnitude  | 0.46434
Eclipse Obscuration  | 0.35755
Gamma  | 1.28859
Sun Right Ascension  | 07h59m09.9s
Sun Declination  | +20°37'14.1"
Sun Semi-Diameter  | 15'44.4"
Sun Equatorial Horizontal Parallax  | 08.7"
Moon Right Ascension  | 07h59m44.7s
Moon Declination  | +21°55'14.5"
Moon Semi-Diameter  | 16'37.4"
Moon Equatorial Horizontal Parallax  | 1°01'00.4"
ΔT  | 52.6 s

## Eclipse season

[edit]

See also: Eclipse cycle

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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of June–July 1982  June 21
Ascending node (new moon)
| July 6
Descending node (full moon)
| July 20
Ascending node (new moon)

|
|

|  |
Partial solar eclipse
Solar Saros 117 | Total lunar eclipse
Lunar Saros 129 | Partial solar eclipse
Solar Saros 155

## Related eclipses

[edit]

### Eclipses in 1982

[edit]

* A total lunar eclipse on January 9.
* A partial solar eclipse on January 25.
* A partial solar eclipse on June 21.
* A total lunar eclipse on July 6.
* A partial solar eclipse on July 20.
* A partial solar eclipse on December 15.
* A total lunar eclipse on December 30.

### Metonic

[edit]

* Preceded by: Solar eclipse of October 2, 1978

### Tzolkinex

[edit]

* Followed by: Solar eclipse of August 31, 1989

### Half-Saros

[edit]

* Preceded by: Lunar eclipse of July 15, 1973
* Followed by: Lunar eclipse of July 26, 1991

### Tritos

[edit]

* Preceded by: Solar eclipse of August 20, 1971

### Solar Saros 155

[edit]

* Preceded by: Solar eclipse of July 9, 1964
* Followed by: Solar eclipse of July 31, 2000

### Inex

[edit]

* Preceded by: Solar eclipse of August 9, 1953
* Followed by: Solar eclipse of July 1, 2011

### Triad

[edit]

* Preceded by: Solar eclipse of September 18, 1895
* Followed by: Solar eclipse of May 20, 2069

### Solar eclipses of 1979–1982

[edit]

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.[3]

The partial solar eclipses on June 21, 1982 and December 15, 1982 occur in the next lunar year eclipse set.

Solar eclipse series sets from 1979 to 1982

Descending node  |  | Ascending node
Saros  | Map  | Gamma  | Saros  | Map  | Gamma
120

Totality in Brandon, MB,
Canada | February 26, 1979

Total  | 0.8981  | 125  | August 22, 1979

Annular  | −0.9632
130  | February 16, 1980

Total  | 0.2224  | 135  | August 10, 1980

Annular  | −0.1915
140  | February 4, 1981

Annular  | −0.4838  | 145  | July 31, 1981

Total  | 0.5792
150  | January 25, 1982

Partial  | −1.2311  | 155  | July 20, 1982

Partial  | 1.2886

### Saros 155

[edit]

This eclipse is a part of Saros series 155, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on June 17, 1928. It contains total eclipses from September 12, 2072 through August 30, 2649; hybrid eclipses from September 10, 2667 through October 2, 2703; and annular eclipses from October 13, 2721 through May 8, 3064. The series ends at member 71 as a partial eclipse on July 24, 3190. 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 will be produced by member 14 at 4 minutes, 5 seconds on November 6, 2162, and the longest duration of annularity will be produced by member 63 at 5 minutes, 31 seconds on April 28, 3046. All eclipses in this series occur at the Moon’s ascending node of orbit.[4]

Series members 1–16 occur between 1928 and 2200:

1  | 2  | 3

June 17, 1928 |
June 29, 1946 |
July 9, 1964
4  | 5  | 6

July 20, 1982 |
July 31, 2000 |
August 11, 2018
7  | 8  | 9

August 21, 2036 |
September 2, 2054 |
September 12, 2072
10  | 11  | 12

September 23, 2090 |
October 5, 2108  |
October 16, 2126
13  | 14  | 15

October 26, 2144  |
November 7, 2162  |
November 17, 2180

November 28, 2198

### Metonic series

[edit]

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.

22 eclipse events between December 13, 1898 and July 20, 1982

December 13–14  | October 1–2  | July 20–21  | May 9  | February 24–25
111  | 113  | 115  | 117  | 119

December 13, 1898  |  |
July 21, 1906 |
May 9, 1910 |
February 25, 1914
121  | 123  | 125  | 127  | 129

December 14, 1917 |
October 1, 1921 |
July 20, 1925 |
May 9, 1929 |
February 24, 1933
131  | 133  | 135  | 137  | 139

December 13, 1936 |
October 1, 1940 |
July 20, 1944 |
May 9, 1948 |
February 25, 1952
141  | 143  | 145  | 147  | 149

December 14, 1955 |
October 2, 1959 |
July 20, 1963 |
May 9, 1967 |
February 25, 1971
151  | 153  | 155

December 13, 1974 |
October 2, 1978 |
July 20, 1982

### Tritos series

[edit]

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 1982

November 29, 1807
(Saros 139)  |
October 29, 1818
(Saros 140)  |
September 28, 1829
(Saros 141)  |
August 27, 1840
(Saros 142)  |
July 28, 1851
(Saros 143)

June 27, 1862
(Saros 144)  |
May 26, 1873
(Saros 145)  |
April 25, 1884
(Saros 146)  |
March 26, 1895
(Saros 147)  |
February 23, 1906
(Saros 148)

January 23, 1917
(Saros 149)  |
December 24, 1927
(Saros 150)  |
November 21, 1938
(Saros 151)  |
October 21, 1949
(Saros 152)  |
September 20, 1960
(Saros 153)

August 20, 1971
(Saros 154)  |
July 20, 1982
(Saros 155)

### Inex series

[edit]

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 2069

November 18, 1808
(Saros 149)  |
October 29, 1837
(Saros 150)  |
October 8, 1866
(Saros 151)

September 18, 1895
(Saros 152)  |
August 30, 1924
(Saros 153)  |
August 9, 1953
(Saros 154)

July 20, 1982
(Saros 155)  |
July 1, 2011
(Saros 156)  |

May 20, 2069
(Saros 158)  |  |

## References

[edit]

1. ^ "July 20, 1982 Partial Solar Eclipse". timeanddate. Retrieved 9 August 2024.
2. ^ "Partial Solar Eclipse of 1982 Jul 20". EclipseWise.com. Retrieved 9 August 2024.
3. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
4. ^ "NASA - Catalog of Solar Eclipses of Saros 155". eclipse.gsfc.nasa.gov.

## External links

[edit]

* Earth visibility chart and eclipse statistics Eclipse Predictions by Fred Espenak, NASA/GSFC
* Google interactive map
* Besselian elements

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