gegenschein

noun

1. (countable, uncountable)A faint brightening of the night sky in the region of the ecliptic directly opposite the Sun.

   “My object in appearing before the Association, at this time, is to present the observations of several other persons on the gegenschein or completed arch of the zodiacal light, of which I have received accounts since our meeting in Motreal.”

   “The zodiacal light, gegenschein, and zodiacal band … are all visible.”