| Partial eclipse | |
 Map | |
| Gamma | 1.2886 |
|---|---|
| Magnitude | 0.4643 |
| Maximum eclipse | |
| Coordinates | 68°36′N64°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 partialsolar eclipse occurred at the Moon'sascending node of orbit on Tuesday, July 20, 1982,[1] with amagnitude of 0.4643. Asolar eclipse occurs when theMoon passes betweenEarth and theSun, 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 onJanuary 25,June 21, andDecember 15.
A partial eclipse was visible for parts of the northernSoviet Union, northernAlaska, northernCanada,Greenland, andNorthern Europe.
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]
| 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 |
| 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 |
This eclipse is part of aneclipse 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 afortnight. The first and last eclipse in this sequence is separated by onesynodic month.
| 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 |
This eclipse is a member of asemester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternatingnodes of the Moon's orbit.[3]
The partial solar eclipses onJune 21, 1982 andDecember 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.jpg) Totality inBrandon, 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 | |
This eclipse is a part ofSaros series 155, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse onJune 17, 1928. It contains total eclipses fromSeptember 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 oneexeligmos 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’sascending 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 |
| 16 | ||
 November 28, 2198 | ||
Themetonic 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 | ||
This eclipse is a part of atritos cycle, repeating at alternating nodes every 135synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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) | |||
This eclipse is a part of the long periodinex cycle, repeating at alternating nodes, every 358synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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) | ||
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