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Also known as the Counterglow. The Gegenschein is very faint light seen on the ecliptic, 180o from the Sun. It is part of the zodiacal light and it is a reflection of light by dust particles in the ecliptic plane of the solar system. It is about 15o to 20o across, and it's fainter by a factor of 15 relative to the zodiacal light. It is best seen when it is far from the Milky Way (Galactic plane) in September and October.

Calculate the Gegenschein Coordinates

Good for 1950 to 2050, based on low accuracy coordinates of the Sun
Day Month Year

R.A. Dec.

Read more (in Hebrew) about the Gegenschein in the Hebrew Astropedia of the TAU AstroClub.

Constructed: November 1998, by: Eran Ofek