Compare Stellarium and SkyMap's lunar eclipse phases
Hello all of you,
I am comparing eclipses with different computer programs. And one of them is Stellarium 0.13.3
So I look at location Babylon: 32.53 Lat,44.42 Long, height 126m
I am using GMT as my home time zone. (Babylon hss 2 hours difference)
DeltaT: Stephenson&Holden 1986
Go to date: -381/6/18
Search Moon and center the view on the Moon so one can observe the earth's shadow when changing time
around 18:09 (GMT) you see the max eclipse.
around 17:02 (GMT) is the start of the umbral phase
around 19:16 (GMT) is the end of the umbral phase
When using SkyMap Pro 11 it reports (also uses Stephenson&Holden 1986):
around 18:09 (GMT) you see the max eclipse.
around 16.47 (GMT) is the start of the umbral phase
around 19:26 (GMT) is the end of the umbral phase
One can see a difference of the start and end of the umbral phase (resp. 15 and 10 minutes).
So I checked some 10 others other lunar eclipses (total or partial, between -720 and -381) and they are ok-ish in Stellarium, when compared to SkyMap Pro 11.
For instance -381/12/12 (total)
Stellarium
around 18:14 (GMT) is the start of the umbral phase
around 21:44 (GMT) is the end of the umbral phase
SkyMap Pro 11
around 18:16 (GMT) is the start of the umbral phase
around 21:42 (GMT) is the end of the umbral phase
So why does the -381/6/18 eclipse have different umbral phases in Stellarium? I can understand a few minutes (as one needs to see the changes in Stellarium with the naked eye, but 15 minutes is considerable [at least for my application]).
Any ideas? Thanks.
All the best,
Victor
P.S. I also checked Swiss Ephemeris and that one has similar results as SkyMap Pro 11
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