When the moon is in the umbra, it is hidden from the sundra."
Don Machholz
"It is one of the most interesting features on the moon."-Don Machholz
Penumbral lunar eclipses, the stars Betelgeuse and Castor, and the Quadrantids meteor shower. Pod-0001-Star-Map-For-January-8-2020Download Formation-and-Past-Evolution-of-the-Meteoroid-Complex-of-Comet-96P_MachholzDownload
"In Messier's case it was known comets leading to new Messier Objects. Centuries later it was known Messier Objects leading to new comets."-Don Machholz
