An annular solar eclipse occurred at the Moon's descending node of orbit between Tuesday, August 10 and Wednesday, August 11, 1915,[1] [2] [3] [4] with a magnitude of 0.9853. 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 5.8 days after apogee (on August 5, 1915, at 2:40 UTC), the Moon's apparent diameter was smaller.[5]
Annularity was visible from the Pacific Ocean, with the only land being Haha-jima Group in Japan, where the eclipse occurred on August 11 because it is west of International Date Line. A partial eclipse was visible for parts of Northeast Asia, northern Oceania, and Hawaii.
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.[6]
| First Penumbral External Contact | 1915 August 10 at 19:56:16.8 UTC | |
| First Umbral External Contact | 1915 August 10 at 20:58:11.2 UTC | |
| First Central Line | 1915 August 10 at 20:59:11.3 UTC | |
| Greatest Duration | 1915 August 10 at 20:59:11.3 UTC | |
| First Umbral Internal Contact | 1915 August 10 at 21:00:11.3 UTC | |
| First Penumbral Internal Contact | 1915 August 10 at 22:02:04.6 UTC | |
| Equatorial Conjunction | 1915 August 10 at 22:51:48.2 UTC | |
| Ecliptic Conjunction | 1915 August 10 at 22:52:16.2 UTC | |
| Greatest Eclipse | 1915 August 10 at 22:52:24.5 UTC | |
| Last Penumbral Internal Contact | 1915 August 10 at 23:42:46.5 UTC | |
| Last Umbral Internal Contact | 1915 August 11 at 00:44:40.1 UTC | |
| Last Central Line | 1915 August 11 at 00:45:37.4 UTC | |
| Last Umbral External Contact | 1915 August 11 at 00:46:34.7 UTC | |
| Last Penumbral External Contact | 1915 August 11 at 01:48:26.3 UTC |
| Eclipse Magnitude | 0.98528 | |
| Eclipse Obscuration | 0.97078 | |
| Gamma | 0.01237 | |
| Sun Right Ascension | 09h18m36.8s | |
| Sun Declination | +15°41'16.7" | |
| Sun Semi-Diameter | 15'46.8" | |
| Sun Equatorial Horizontal Parallax | 08.7" | |
| Moon Right Ascension | 09h18m37.9s | |
| Moon Declination | +15°41'54.9" | |
| Moon Semi-Diameter | 15'18.4" | |
| Moon Equatorial Horizontal Parallax | 0°56'10.4" | |
| ΔT | 17.8 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.