DE431 mismatch

Bug #1606583 reported by gzotti on 2016-07-26
This bug affects 1 person
Affects Status Importance Assigned to Milestone

Bug Description


There is a well-known total solar eclipse which occured in Babylon (32° 32′ 31.2″ N, 44° 25′ 12″ E) : 15 April 136 BC or -135.
According to Fred Espenak/NASA, the maximum eclipse time was : 5:27:11 UT and the Sun altitude / azimuth was : 35° / 103°.
When using the default ephemeris of Stellarium (, Windows 64 bits), the result is consistent with the calculation of Fred Espenak, however if I use JPL DE431, the maximum eclipse time is : 5:42:00 UT and the Sun altitude / azimuth is 38° / 106°.
Do you intend to solve this problem for the next version 0.15 ?
Anyway thank you for your amazing work improving Stellarium.

(more discussion in the thread)

gzotti (georg-zotti) wrote :

It seems something is wrong in our understanding of TT vs DE431's Teph. This becomes apparent esp. with eclipses. Sorry, I have to fix that, but after 0.15.0.

Changed in stellarium:
milestone: none → 1.0.0
Alexander Wolf (alexwolf) wrote :

Could you check this issue in last beta?

gzotti (georg-zotti) wrote :

Yes, looks good at r9170. The DeltaT correction done around November 2016(?) seems to have solved it.

Changed in stellarium:
status: Confirmed → Fix Committed
milestone: 1.0.0 → 0.15.2
Changed in stellarium:
status: Fix Committed → Fix Released
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