Was the map you are using an actual 360 degree render, or just what could be about 30-45 degrees of sky in a normal render? An actual 360 render should be seamless, this looks to have a seam, so it may be doubtful that it is a full 360.

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy