got it
this is turning into a bit of a conundrum .

_________________
"I don't pitch Linux to my friends, I let Microsoft do that for me."
Using OpenSUSE 42.1 & Scientific Linux 6.7

Jupiter for the year 2200 AD

While for set altitude = 0 is out of 3min. and the RA, DEC of the date are correct, the horizontal grid AZ is displaced, like was pointed out elsewhere.
After that date the forecasts degenerates increasly. Still here: rise/set times have precession injected, the current version not.

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Never at rest.

The post above was "cryptic" because topocentric. This is the same screenshot as geocentric. I can see it match! (aside the horiz. grid's issue).

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Never at rest.

John, the collation work. I made a new ANSI file named "celestia_venus.tf" (it should mean "text fixes"?) with inside the block of the changed values and a blank space at end. Then I've modified the SPICE Venus .SSC in the part of SpiceRotation:


any suggestion on which names to give to such .tf files so that could be more rigorous?

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Never at rest.

Recapitulating, before the madness...

1) Venus VSOP87

2) Venus SPICE default (+ "earth_fixed.tf")

Bad grid orientation (W), degrees, and planetary surface.

3) Venus SPICE default (+ "earth_fixed.tf + "celestia_venus.tf")

good degrees and planetary surface, bad grid orientation (W).

There is not way to get the (E) grid. BUT:

4) Uranus VSOP87

5) Uranus SPICE default (+ "earth_fixed.tf")

good grid (E), bad surface and bad degrees

6) Uranus SPICE default (+ "earth_fixed.tf + "celestia_uranus.tf")

they matches in all. Nonetheless the "rotation matrix" of the two "celestia_xxx.tf" is the same! In this case the grid was (E) in VSOP87 and is remained (E) in both SPICE settings, while in Venus was (E) in VSOP87 and then is become (W) in both SPICE settings.

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Never at rest.

...continuing...

Pluto VSOP87

Pluto SPICE default (+ "earth_fixed.tf")

They matches but the Pluto's pole has been inverted (IAU 2009 + erratum) with respect to VSOP87 and therefore should be so:

3) Pluto SPICE default (+ "earth_fixed.tf + "celestia_pluto.tf")


the .tf to play with:


P.S.
The variation in light shader by both SPICE configurations are still a mistery.

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Never at rest.

The only guess about the different grid's behavior is that Venus is an inner planet and Uranus an outer planet...

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Never at rest.

But what a hel...

just adding the minus sign before the SpiceRotation's Kernel table and all works fine!

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Never at rest.

...

Venus


Uranus


Triton


Pluto


Charon

_________________
Never at rest.

i have not had time to do a spice / non spice comparison

i do have the new add on and tonight should be doing a non spice celestia 1.7 test

_________________
"I don't pitch Linux to my friends, I let Microsoft do that for me."
Using OpenSUSE 42.1 & Scientific Linux 6.7