Lumpy Darkness wrote:
> We can see the zodiacal light after sunset, but the Gegenschein would
> be best viewed when the sun is at "anti-zenithal" position (how is
> that for a made up word Jamie!) or nadir...
Cute word, but you'll never see the spot on the sky that is directly
under your feet.
The word you need is "anti-solar" point.
During the day, you would use that word to specify the center of
curvature of a rainbow.
Clear Skies (and terminology) :-)
-- Jim Van Nuland, San Jose (California) Astronomical Association <a href="http://www.svpal.org/~jvn/ ">JVN's web site</a>