Fenerit and I are currently working on un update for our Ephemerides and OjectRiseSet plugins/addons for Celestia, to solve 2 bugs in our current versions of the plugins/addons.
To prevent an introduction of new bugs with these addons (as happened previous year

), thoroughly testing is now going on. So I also decided to test the OjectRiseSet plugin/addon in Celestia Spice now.
There I found the next strange behaviour, I cannot understand...
First below, we find the correct behaviour of the SunRiseSet calculation and visualization in Celestia WITHOUT Spice.
Attachment:
File comment: SunRiseSet WITHOUT Spice
Sunriseset WITHOUT spice_75.jpg [ 71.64 KiB | Viewed 8984 times ]
The calculated times are accurate and the Celestia visualization is accordingly.
Now below (generated with exactly the same code), we find the INcorrect behaviour of the SunRiseSet calculation and visualization in Celestia WITH Spice.
Attachment:
File comment: SunRiseSet WITH Spice
Sunriseset WITH spice_75.jpg [ 107.56 KiB | Viewed 8984 times ]
First of all, the times of RiseSet are practically the same and due to SPICE one could say the times may be more accurate because of more precise RA/DEC calculations in Celestia. So that is not my point.
BUT the visualization completely mismatches the calculation !!!!!
As you can see, WITH Spice the Sun is already coming up at a time NOT matching the calculation, about half an hour earlier and also the Sunset mismatches with the calculated times.
Also we can see that the Celestia Markers do not point down, but they point to the middle of the screen in Spice.
As said, exactly the same Scripting code is used, but the behaviour in Spice seems different.
The approach in the scripts is as follows:
Code:
Goto the specified LongLat
Go Synchronous
Goto the surface
Set time at calculated Rise and Set respectvily (in both observers)
Center the Sun on the screen (in both observers)
Set time about half an our earlier (left observer)
Set time about an hour earlier (right observer)
display the RiseSet respectively with some accelerated speed.
It looks like however (also because of the different markers), that WITH Spice we landed on the surface somewere else...
At least I cannot explain this anymore, so I was hoping to find some help / explanation about this Celestia Spice behaviour here on the CM forum.
Marco