An annular eclipse of the Sun occurred on Saturday 12 February, 1831 UT (31 Jan, 1831 Old Style), with maximum eclipse at 17:21 UT. A large annular eclipse covered 98% of the Sun, creating a dramatic spectacle for observers in a path up to 100 km wide; it lasted 1 minute and 57 seconds at the point of maximum eclipse. It was seen across northern Mexico, the eastern USA, and eastern Canada. The partial eclipse was visible from most of North America.

The annular eclipse lasted for 1 minute and 57 seconds. Maximum eclipse was at 17:21:38 UT.

During this eclipse the Sun was 0.540° in apparent diameter, 1.3% larger than average. The Moon was 7 days after apogee and 5 days before perigee. At maximum eclipse it was 0.529° in apparent diameter, which is around average; this was not large enough to cover the Sun, which is why this was an annular eclipse. The statistics page has information on the ranges of the sizes of the Sun and Moon.

Nat Turner was inspired to begin his slave rebellion by this eclipse, which was seen in Virginia.

Overview Map

This map sourced from NASA's Eclipse Web Site shows the visibility of the annular solar eclipse. It also shows the broader area in which a partial eclipse was seen. (Click on it for the full-sized version.)

Eclipse Season and Saros Series

This eclipse season contains 2 eclipses:

This was the 58th eclipse in solar Saros series 118.The surrounding eclipses in this Saros series are:

Eclipse Parameters

UT Date/time (max) 17:21:38 on 12 Feb UT TDT Date/time (max) 17:21:45 on 12 Feb TDT
Saros Series 118 Number in Series 57
Penumbral Magnitiude Central Magnitiude 0.9807
Gamma 0.7288 Path Width (km) 100
Delta T 0m07s Error ± 0m01s (95%)
Penumbral Duration Partial Duration
Total Duration 1m57s
Partial Rating Total Rating
Sun Distance 147753081 km (13.6%) Moon Distance 380323 km (47.6%)
Sun Diameter 0.540° Moon Diameter 0.523° - 0.529°
Apogee 07:12 on 5 Feb UT Perigee 04:18 on 18 Feb UT

Note that while all dates and times on this site (except where noted) are in UT, which is within a second of civil time, the dates and times shown in NASA's eclipse listings are in the TDT timescale.

The Sun and Moon distances are shown in km, and as a percentage of their minimum - maximum distances; hence 0% is the closest possible (Earth's perihelion, or the Moon's closest possible perigee) and 100% is the farthest (aphelion, the farthest apogee). The statistics page has information on the ranges of sizes of the Sun and Moon.

Data last updated: 2015-06-21 22:11:46 UTC.