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Calculate the Gegenschein Coordinates

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.