An annular solar eclipse occurred at the Moon's descending node of orbit on Monday, August 21, 1933,[1] with a magnitude of 0.9801. 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 only 5.6 days after apogee (on August 15, 1933, at 15:40 UTC), the Moon's apparent diameter was smaller.[2]
Annularity was visible from Italian Libya (today's Libya), Egypt, Mandatory Palestine (today's Israel, Palestine and Jordan) including Jerusalem and Amman, French Mandate for Syria and the Lebanon (the part now belonging to Syria), Iraq including Baghdad, Persia, Afghanistan, British Raj (the parts now belonging to Pakistan, India, Bangladesh and Myanmar), Siam (name changed to Thailand later), Dutch East Indies (today's Indonesia), North Borneo (now belonging to Malaysia), and Australia. A partial eclipse was visible for parts of Northeast Africa, Eastern Europe, Asia, and Australia.
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]
| First Penumbral External Contact | 1933 August 21 at 02:52:30.3 UTC | |
| First Umbral External Contact | 1933 August 21 at 03:54:48.4 UTC | |
| First Central Line | 1933 August 21 at 03:55:58.9 UTC | |
| Greatest Duration | 1933 August 21 at 03:55:58.9 UTC | |
| First Umbral Internal Contact | 1933 August 21 at 03:57:09.4 UTC | |
| First Penumbral Internal Contact | 1933 August 21 at 04:59:51.0 UTC | |
| Equatorial Conjunction | 1933 August 21 at 05:44:23.7 UTC | |
| Ecliptic Conjunction | 1933 August 21 at 05:48:11.5 UTC | |
| Greatest Eclipse | 1933 August 21 at 05:49:10.9 UTC | |
| Last Penumbral Internal Contact | 1933 August 21 at 06:38:38.7 UTC | |
| Last Umbral Internal Contact | 1933 August 21 at 07:41:17.5 UTC | |
| Last Central Line | 1933 August 21 at 07:42:25.2 UTC | |
| Last Umbral External Contact | 1933 August 21 at 07:43:32.9 UTC | |
| Last Penumbral External Contact | 1933 August 21 at 08:45:47.4 UTC |
| Eclipse Magnitude | 0.98011 | |
| Eclipse Obscuration | 0.96062 | |
| Gamma | 0.08688 | |
| Sun Right Ascension | 09h59m34.9s | |
| Sun Declination | +12°16'29.3" | |
| Sun Semi-Diameter | 15'48.7" | |
| Sun Equatorial Horizontal Parallax | 08.7" | |
| Moon Right Ascension | 09h59m43.6s | |
| Moon Declination | +12°20'51.3" | |
| Moon Semi-Diameter | 15'15.5" | |
| Moon Equatorial Horizontal Parallax | 0°55'59.9" | |
| ΔT | 23.9 s |
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.
| August 21 Descending node (new moon) | September 4 Ascending node (full moon) | ||
| Penumbral lunar eclipse Lunar Saros 108 | Annular solar eclipse Solar Saros 134 | Penumbral lunar eclipse Lunar Saros 146 |