Question on world textures

I have a mercator projection of a star field which I have been trying to map to the world texture. However, it seems that no matter what settings I use I either get huge distortion or only the top half the the world will receive the texture. Can anyone provide any tips on how to do this? I’m trying to create a space animation and things look a little odd when the stars are stretched/missing.

I’m using 2.5 alpha 0 if it makes any difference.

Thank you for your time.

Try this:
Shading > World Buttons: Click “Real” next to preview
Shading > World Buttons > Texture and Input: Click “AngMap”
Shading > World Buttons > Map To: Unclick “Blend”, Click “Hori”