To make the horizon flat in Moho I had to squash the sphere for the landscape panorama. The space panorama is based on a round sphere.
Use Pan/Tilt camera tool in Moho and look around inside the domes!
Created in Moho 14. Works in 13.5 but preview isn't as good as in 14.
Below are the links to the preview images and the project files.
Google drive links
Preview image landscape panorama:
https://drive.google.com/file/d/1lxfJO9 ... IrQAp/view
Moho 14 project:
https://drive.google.com/file/d/1DGCf08 ... drive_link
Preview image space/star panorama:
https://drive.google.com/file/d/1eK8htp ... NDu9B/view
Moho 14 project:
https://drive.google.com/file/d/1Mn6jOK ... drive_link

Tutorial below - Some info
Always save the image with "Save as" if you paint inside Blender since Blender doesn't save the image with the .blend file.
Use Image editor > Image > Save as. If you don't save the image there will be no image next time you open the Blender project.
Moho doesn't like tris in 3d geometry so I remove the tris on the sphere (top and bottom).
Then I extrude the edges to create quads that almost close the holes.
(tris = polygon with 3 vertices, quads = polygon with 4 vertices).
UVsquares is the only addon used and it's available here or on github.
Since the image texture is rather large (8k < or more) you can paint it in separate image editor software.
It can be rather slow painting inside Blender. The UV grid can also be exported as an overlay image
and act as a reference to where the UV edges/limits are in for example Photoshop.
I don't show UV overlay export in this raw tutorial though.
I don't use Eevee or Cycles but Workbench render engine with flat shading. This works ok.
Raw tutorial, no sound. Some Blender basic knowledge is necessary:
https://drive.google.com/file/d/1eOzQRk ... drive_link
Addon for Blender
UVsquares used when unwrapping the UV and make the UV square or rectangular:
https://drive.google.com/file/d/1PKYXpX ... drive_link
Since image resolution is limited on imported 3d objects:
Alternate method is to create a panorama image in Blender (use high resolution), import it to Moho then use the script in Moho to generate the sphere.
Scripts > Image > Spherical panorama
This method keeps the original image resolution inside of Moho.