Extend aberration range

[henrysky]

Description

As @gzotti suggested, adding aberration to geodesic grid corners seems to fix the star disappearance issue. But nebulae/galaxies images/markers still need to be fixed too. I will need more time to find where I should add the aberration to them too or if anyone is more familiar with nebulae/galaxies images/markers, helps would be appreciated!

Fixes #4742

Screenshots (if appropriate):

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping

How Has This Been Tested?

Test Configuration:

• Operating system: <Name, version number>
• Graphics Card: <Manufacturer (likely Intel, NVidia, AMD?), Model (HD, Geforce, Radeon..., with model number), driver version?>

Checklist:

• My code follows the code style of this pgzottiroject.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (header file)
• I have updated the respective chapter in the Stellarium User Guide
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[github-actions]

Great PR! Please pay attention to the following items before merging:

Files matching src/**/*.cpp:

• Are possibly unused includes removed?

This is an automatically generated QA checklist based on modified files.

[Atque]

Great work!

I guess we should add aberration to the Moon as well (for values < 1, as to keep accuracy for stellar and planetary occultations), otherwise toggling it with high values looks weird with the Moon in frame.

[gzotti]

I am not sure if DSO icons or even textures need any special treatment, I think they are not in icosaeder zones. Do they also disappear?

Concerning the Moon, I just don't understand why aberration should not be applied here. Is it integrated to the usual ephemeris? But what really needs to be done w.r.t. occultations is sketched in #1959 and #1924.

[Atque]

Yes, I think the solution to keep occultation timings was to disable it for the Moon as seen from Earth. This suggests the ephemeris has aberration applied to the Moon already. I can't see a difference between DE440/441 and VSOP87, so either all of them have integrated aberration for the Moon (but not planets apparently, which appears to be weird), or the Stellarium code applies it somewhere else.

[henrysky]

I am not sure if DSO icons or even textures need any special treatment, I think they are not in icosaeder zones. Do they also disappear?

Yes they are also disappearing, see below

Screen.Recording.2026-02-03.at.7.10.32.PM.mov

[Atque]

Some kind of clipping that needs to be extended?

[gzotti]

@henrysky any news here?

[henrysky]

My bad, Don't have time/energy to work on this after starting a new job. I think on of the issue is DSO textures does not affected by aberration hence misalign with stars under high aberration value. I'll keep working on this as soon as I get a chance.