Solar eclipse of April 8, 1921
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| Annular eclipse | |
 | |
 Map | |
| Gamma | 0.8869 |
|---|---|
| Magnitude | 0.9753 |
| Maximum eclipse | |
| Duration | 110 s (1 min 50 s) |
| Coordinates | 64°30′N 5°36′E / 64.5°N 5.6°E |
| Max. width of band | 192 km (119 mi) |
| Times (UTC) | |
| Greatest eclipse | 9:15:01 |
| References | |
| Saros | 118 (63 of 72) |
| Catalog # (SE5000) | 9330 |
An annular solar eclipse occurred at the Moon's descending node of orbit on Friday, April 8, 1921,[1] with a magnitude of 0.9753. 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. The Moon's apparent diameter was near the average diameter because it occurred 6.5 days after apogee (on April 1, 1921, at 20:50 UTC) and 8.3 days before perigee (on April 16, 1921, at 16:10 UTC).[2]
Annularity was visible from northern Scotland, northwestern tip of Norway, and islands in the Arctic Ocean in Russian SFSR. A partial eclipse was visible for parts of North Africa, Europe, Central Asia, and the Russian SFSR.
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 | 1921 April 8 at 06:51:44.6 UTC |
| First Umbral External Contact | 1921 April 8 at 08:21:25.5 UTC |
| First Central Line | 1921 April 8 at 08:23:38.1 UTC |
| Greatest Duration | 1921 April 8 at 08:23:38.1 UTC |
| First Umbral Internal Contact | 1921 April 8 at 08:25:55.2 UTC |
| Ecliptic Conjunction | 1921 April 8 at 09:05:08.6 UTC |
| Greatest Eclipse | 1921 April 8 at 09:15:01.3 UTC |
| Equatorial Conjunction | 1921 April 8 at 09:44:56.4 UTC |
| Last Umbral Internal Contact | 1921 April 8 at 10:03:48.2 UTC |
| Last Central Line | 1921 April 8 at 10:06:02.5 UTC |
| Last Umbral External Contact | 1921 April 8 at 10:08:12.1 UTC |
| Last Penumbral External Contact | 1921 April 8 at 11:37:57.8 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.97530 |
| Eclipse Obscuration | 0.95120 |
| Gamma | 0.88692 |
| Sun Right Ascension | 01h06m22.7s |
| Sun Declination | +07°03'40.4" |
| Sun Semi-Diameter | 15'58.0" |
| Sun Equatorial Horizontal Parallax | 08.8" |
| Moon Right Ascension | 01h05m24.3s |
| Moon Declination | +07°51'45.1" |
| Moon Semi-Diameter | 15'28.0" |
| Moon Equatorial Horizontal Parallax | 0°56'45.6" |
| ΔT | 22.3 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.
| April 8 Descending node (new moon) | April 22 Ascending node (full moon) |
|---|---|
|  |
| Annular solar eclipse Solar Saros 118 | Total lunar eclipse Lunar Saros 130 |
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