Timezone / Date

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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 ± 21m37s (with 95% confidence). This equates to an error in longitude of ± 5 degrees, or around ± 586 km (364 miles) at the latitude of greatest eclipse.

A total eclipse of the Moon occurred on 4 May, 1021 BC UT Old Style, with maximum eclipse at 16:43 UT. The Moon was plunged into darkness for 1 hour and 19 minutes, in a deep total eclipse which saw the Moon 29% 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 37 minutes in total.

The penumbral eclipse lasted for 5 hours and 48 minutes. The partial eclipse lasted for 3 hours and 37 minutes. The total eclipse lasted for 1 hour and 19 minutes. Maximum eclipse was at 16:43:33 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 3 eclipses:

This was the 34th eclipse in lunar Saros series 34.The surrounding eclipses in this Saros series are:

This Saros series, lunar Saros series 34, is linked to solar Saros series 41. The nearest partner eclipses in that series are:

Eclipse Parameters

UT Date/time (max) 16:43:33 on 4 May UT TDT Date/time (max) 23:51:22 on 4 May TDT
Saros Series 34 Number in Series 34
Penumbral Magnitiude 2.3147 Central Magnitiude 1.2876
Gamma 0.3035 Path Width (km)
Delta T 7h08m Error ± 21m37s (95%)
Penumbral Duration 5h48m Partial Duration 3h37m
Total Duration 1h19m
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.

Data last updated: 2015-06-21 22:11:40 UTC.