I like to rotate it a little along the z axis also, since the earth is
tilted. For example,

   object {Earth rotate (clock * 360) * y rotate -10 * z}

The z rotation is for the tilt of the earth on its axis. Technically, the
value should be -23.5 degrees.

Also, if anyone's interested, I made a .png earth image with transparent
oceans, so you can give the water a different finish than the land.

Regards,
Dave Blandston

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