A penumbral eclipse of the Moon occurred on Thursday 1 May, 1817 UT (19 Apr, 1817 Old Style), with maximum eclipse at 07:43 UT. In this extremely marginal eclipse, the Moon barely clipped the edge of the Earth's penumbral shadow. This caused a microscopic darkening of just 16% of the Moon's disc for 1 hour and 44 minutes, which was essentially impossible to see.

The penumbral eclipse lasted for 1 hour and 44 minutes. Maximum eclipse was at 07:43:49 UT.

During this eclipse the Moon was at perigee, making it extremely large. At maximum eclipse it was 0.567° in apparent diameter, which is 6.8% larger than average. The statistics page has information on the ranges of the sizes of the Sun and Moon, and the Moon data page displays detailed information on the Moon's key dates.

Interactive Map

This map shows the visibility of the eclipse at maximum eclipse, when it was visible within the bright area on the map. Note that the map is approximate, and if you were near the edge of the area of visibility, the moon was very close to the horizon and may not have been practically visible.

You can use the zoom controls to zoom in and out, and pan to see areas of interest. The green marker in the centre shows where the Moon will be directly overhead at maximum eclipse.

The interactive map is currently not available.

Overview Map

This map sourced from NASA Goddard Space flight Center: GSFC Eclipse Web SiteGSFC Eclipse Web Site
The primary source of all the information on eclipses presented here at Hermit Eclipse. (NASA Goddard Space flight Center)
https://eclipse.gsfc.nasa.gov/eclipse.html
shows the visibility of the eclipse. (Click on it for the full-sized version.)

Eclipse Season and Saros Series

This eclipse season contains 3 eclipses:

This was the 71st eclipse in lunar Saros series 99.The surrounding eclipses in this Saros series are:

Eclipse Parameters

UT Date/time (max) 07:43:49 on 1 May UT TDT Date/time (max) 07:44:01 on 1 May TDT
Saros Series 99 Number in Series 71
Penumbral Magnitiude 0.1554 Central Magnitiude -0.7931
Gamma 1.4587 Path Width (km)
Delta T 0m12s Error ± 0m01s (95%)
Penumbral Duration 1h44m Partial Duration
Total Duration
Partial Rating Total Rating
Sun Distance 150849500 km (77.7%) Moon Distance 357263 km (1.7%)
Sun Diameter 0.529° Moon Diameter 0.557° - 0.567°
Perigee 23:26 on 30 Apr UT Apogee 01:11 on 14 May 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 listingsGSFC Eclipse Web Site
The primary source of all the information on eclipses presented here at Hermit Eclipse. (NASA Goddard Space flight Center)
https://eclipse.gsfc.nasa.gov/eclipse.html
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, and the Moon data page displays detailed information on the Moon's key dates.

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