Introduction - If you have any usage issues, please Google them yourself
A small (code-wise) demo that features earth, with night and day
texture maps, atmospheric effects, an orbiting moon, the sun,
a stars background and optional constellation lines.
The only technical part lies with the atmospheric effect, which
is raytraced on key points, and then interpolated in between.
Yes, I know earth atmosphere s is much thinner, but a thicker
atmosphere looks better :)