counterglow \coun"terglow`\, n. astron.
   an exceedingly faint roundish or somewhat oblong nebulous
   light near the ecliptic and opposite the sun, best seen
   during september and october, when in the constellations
   sagittarius and pisces. its cause is not yet understood.
   called also gegenschein.
   webster 1913 suppl.
see also:
gegenschein 

counterglow
     n : a faint spot of light in the night sky that appears directly
         opposite the position of the sun; a reflection of
         sunlight by micrometeoric material in space syn: gegenschein
see also:
gegenschein