Timezone / Date

You have not selected a timezone for eclipse timings, so all times are shown in UT (essentially GMT).

Accuracy

Due to the erratic rotation of the Earth, the time and location of the eclipse cannot be forecast perfectly. This eclipse's time is estimated to be accurate ± 2h01m (with 95% confidence). This equates to an error in longitude of ± 30 degrees, or around ± 3128 km (1944 miles) at the latitude of greatest eclipse.

A total eclipse of the Moon occurred on 11 December, 1991 BC UT Old Style, with maximum eclipse at 17:59 UT. The Moon was plunged into darkness for 1 hour and 21 minutes, in a deep total eclipse which saw the Moon 36% of its diameter inside the Earth's umbral shadow. The visual effect of this depends on the state of the Earth's atmosphere, but the Moon may have been stained a deep red colour. The partial eclipse lasted for 3 hours and 27 minutes in total.

The penumbral eclipse lasted for 5 hours and 24 minutes. The partial eclipse lasted for 3 hours and 27 minutes. The total eclipse lasted for 1 hour and 21 minutes. Maximum eclipse was at 17:59:09 UT.

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 2 eclipses:

This eclipse belongs to lunar Saros series 3.The surrounding eclipses in this Saros series are:

This Saros series, lunar Saros series 3, is linked to solar Saros series 10. The nearest partner eclipses in that series are:

Eclipse Parameters

UT Date/time (max) 17:59:09 on 11 Dec UT TDT Date/time (max) 06:49:16 on 12 Dec TDT
Saros Series 3 Number in Series
Penumbral Magnitiude 2.3547 Central Magnitiude 1.3616
Gamma -0.2724 Path Width (km)
Delta T 12h50m Error ± 2h01m (95%)
Penumbral Duration 5h24m Partial Duration 3h27m
Total Duration 1h21m
Partial Rating Total Rating

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. For this eclipse, this makes the date shown on this site different to NASA's date.

Data last updated: 2015-06-21 22:11:38 UTC.