Solar eclipse of July 20, 1963
From Wikipedia, the free encyclopedia
| Total eclipse | |
 Map | |
| Gamma | 0.6571 |
|---|---|
| Magnitude | 1.0224 |
| Maximum eclipse | |
| Duration | 100 s (1 min 40 s) |
| Coordinates | 61°42′N 119°36′W / 61.7°N 119.6°W |
| Max. width of band | 101 km (63 mi) |
| Times (UTC) | |
| Greatest eclipse | 20:36:13 |
| References | |
| Saros | 145 (19 of 77) |
| Catalog # (SE5000) | 9427 |
A total solar eclipse occurred at the Moon's ascending node of orbit between Saturday, July 20 and Sunday, July 21, 1963,[1] with a magnitude of 1.0224. 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 total solar eclipse occurs when the Moon's apparent diameter is at least the same size as the Sun's or larger, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with a partial solar eclipse visible over the surrounding region thousands of kilometres wide. Occurring about 4.1 days after perigee (on July 16, 1963, at 19:20 UTC), the Moon's apparent diameter was larger.[2]
Astronomer Charles H. Smiley observed the eclipse from a U.S. Air Force F-104D Starfighter supersonic aircraft that was "racing the Moon's shadow" at 1,300 mph (2,100 km/h) extending the duration of totality to 4 minutes 3 seconds.[3]
The Moon's apparent diameter was 4.8 arcseconds smaller than the January 25, 1963 annular solar eclipse. This was a total solar eclipse because it occurred in July when the Earth is near aphelion (furthest from the Sun). The Moon's apparent diameter was just over 2.2% larger than the Sun's.
Totality was visible from Hokkaido in Japan and Kuril Islands in Soviet Union (now belonging to Russia) on July 21, and Alaska, and Maine in the United States and also Canada on July 20. A partial eclipse was visible for parts of the eastern Soviet Union, North America, Central America, the Caribbean, far northern Europe, and northern South America.
Mamoru Mohri, Japanese scientist and former NASDA astronaut, who was 15 years old and living in Hokkaido at the time, said that seeing this total solar eclipse made him want to become a scientist.[4]
Scientists from the Dominion Observatory, University of Oxford, National Research Council Canada and University of Saskatchewan flew a Royal Canadian Air Force aircraft to observe the total eclipse at 30,000 feet (9,100 m) above the Great Slave Lake area. Due to the lack of navigation system in the area, the plane had to fly directly from Ottawa to Fort Simpson and then back to Ottawa, taking about 13 hours in total. On July 20, thin clouds in the Great Slave Lake area expanded to an altitude of 40,000 feet (12,000 m), so no results were got from optical observations, but the instruments installed on the aircraft still recorded data. In addition, wind speeds of nearly 100 knots (190 km/h; 120 mph) also caused the aircraft to enter the Moon's umbra one minute ahead of schedule, west of the planned location.[5] In addition, scientists from the Royal Astronomical Society of Canada also made radio observations in Grand-Mère, Quebec.[6][7]
In popular culture
The eclipse was featured in the comic strip Peanuts (July 15–20, 1963), with Linus demonstrating a safe way of observing the eclipse as opposed to looking directly at the eclipse. On the day the eclipse passed over his area, Linus was left helplessly standing in the rain with cloud cover entirely too thick to witness the eclipse.[8]
This particular eclipse event plays an important part in two of Stephen King's novels, Gerald's Game (1992) and Dolores Claiborne (1992).
The eclipse is mentioned in passing in John Updike' s novel Couples (1968) in relation to Piet and Foxy.
The eclipse was featured in the season 3 episode of Mad Men entitled "Seven Twenty Three" (2009, S03E07).[9]
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.[10]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1963 July 20 at 18:04:48.2 UTC |
| First Umbral External Contact | 1963 July 20 at 19:14:15.8 UTC |
| First Central Line | 1963 July 20 at 19:14:39.4 UTC |
| First Umbral Internal Contact | 1963 July 20 at 19:15:02.9 UTC |
| Equatorial Conjunction | 1963 July 20 at 20:29:11.6 UTC |
| Greatest Duration | 1963 July 20 at 20:33:37.0 UTC |
| Greatest Eclipse | 1963 July 20 at 20:36:13.1 UTC |
| Ecliptic Conjunction | 1963 July 20 at 20:43:16.7 UTC |
| Last Umbral Internal Contact | 1963 July 20 at 21:57:31.4 UTC |
| Last Central Line | 1963 July 20 at 21:57:52.2 UTC |
| Last Umbral External Contact | 1963 July 20 at 21:58:13.0 UTC |
| Last Penumbral External Contact | 1963 July 20 at 23:07:47.0 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 1.02236 |
| Eclipse Obscuration | 1.04522 |
| Gamma | 0.65710 |
| Sun Right Ascension | 07h57m51.3s |
| Sun Declination | +20°41'02.2" |
| Sun Semi-Diameter | 15'44.3" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 07h58m07.4s |
| Moon Declination | +21°19'05.7" |
| Moon Semi-Diameter | 15'53.9" |
| Moon Equatorial Horizontal Parallax | 0°58'20.8" |
| ΔT | 34.8 s |
Eclipse season
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.
| July 6 Descending node (full moon) | July 20 Ascending node (new moon) |
|---|---|
 | |
| Partial lunar eclipse Lunar Saros 119 | Total solar eclipse Solar Saros 145 |
.jpg)
