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About GeoffG: I have been an amateur astronomer for over 50 years. My main interests are...I have been an amateur astronomer for over 50 years. My main interests are variable stars, the solar system, and deep sky observing. I have a B.Sc. in mathematics and physics and an M.A. and Ph.D. in anthropology. I currently work for Starry Night software doing software support and writing content.show more