- a confirmation that the Stellarium offset has nothing to do with the GRS longitude
- a recommended offset value for version 0.12.x (is 310 OK?)
- explanation why the numbers are different between versions
- why two users using the same version would get different results
Sunday, April 07, 2013
asked for GRS help
Via sourceforge, I submitted a message in the Feedback forum for Stellarium. I asked a few questions.
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Just a copy my answer from SourceForge.org forum.
1. Yes, the rot_rotation_offset value has nothing to do with the "real" Jupiter GRS longitude because Stellarium use "inner" longitude for planets.
2. A "good" values for longitude of GRS can be get from direct observations of Jupiter. Since 0.11.4 Stellarium used the simple equation for calculation of the shift of GRS. This is not ideal but better that before - static position of Jovian GRS.
3. Yes, this is related to texture of Jupiter + technically this file contains "actual" value for GRS on release dates (for fresh install of course).
4. This is very weird - this shouldn't be of course. Can you give some technical info about that installations?
Technically we have plan for improvement of calculation of the GRS (https://blueprints.launchpad.net/stellarium/+spec/great-red-spot) but right now I'm suspended it for version 0.12.2. I think I can set for Jovian rot_rotation_offset the real longitude and just use additional shift for calculation of "inner" longitude.
P.S. Don't worry, your message is good.
P.P.S. 310 is OK and I'm commit changes now.
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