Sun Disk disappears when moved on the z Axis

There's two clipping values. One in the viewport and one in the camera settings. Have you changed them both? Give it a huge boost in value just in case your scene is too big.

Also can you post some screenshots? Even better if it's a screengrab video to see the issue in action.

Sounds like the sun disk is clipped by the sky background then. Maybe the background disk isn't completely vertical. Exaggerated:

Hi Ali AAliserhan ,

Could you upload your .blend file (to Dropbox, Googledrive, or so) and post a link here, so we can have a look at what is going on exactly?

Oh,

I'm afraid I can't make the Sun disappear by Moving it on the Z-Axis up or down (in Blender 4.3)

But what Blender Version are you using?

The Sun magically disappears, when I open your file in 3.6 LTS, but you made it in a later Version...

It's the weirdest thing!

All's fine in 4.2 and 4.3, but the sun disappears in 4.1 (in EEVEE)

It must have something to do with the Alpha Settings in the Material in the 'old' EEVEE, but I ma no expert, when it comes to EEVEE.

If you have the possibility, you can switch to Blender 4.2 or higher, because the new EEVEE seems to have fixed this issue.

My suspicion says it might have something to do with this:

But you can't simply disable the Show Backface unfortunately, that messes it up even more.

  Do people report a lot of issues like this for "old" EEVEE?

I don't know, but they wouldn't report it now anymore, probably. I'm not even sure if it was a bug, or just something inherent to the render engine.

Anyway, glad it works correctly now!