The Essential Guide to Astronomy
Retired cancer surgeon. Enjoys golf and astronomy.
Comets
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By: Jon Greif March 8, 2023
Nebula & Galaxy
By: Jon Greif February 8, 2023
By: Jon Greif January 30, 2023
By: Jon Greif January 25, 2023
By: Jon Greif January 13, 2023
By: Jon Greif January 10, 2023
By: Jon Greif December 30, 2022
By: Jon Greif December 25, 2022
By: Jon Greif December 20, 2022
By: Jon Greif December 15, 2022
Mars-Moon Occultation 2022
By: Jon Greif December 8, 2022
Sun & Moon
By: Jon Greif December 7, 2022
By: Jon Greif November 27, 2022
By: Jon Greif November 20, 2022
Stars & Star Clusters
Lunar Eclipses
By: Jon Greif November 8, 2022
By: Jon Greif November 1, 2022
By: Jon Greif October 9, 2022
By: Jon Greif October 4, 2022
By: Jon Greif September 27, 2022