by Michel Michaud, RASC Victoria Centre Observing Co-chair & Librarian The Lunar X is a claire-obscure effect in which light and shadow creates the appearance of a letter “X” on the rim of the Blanchinus, La Caille and Purbach craters.
by Michel Michaud, RASC Victoria Centre Observing Co-chair & Librarian The Lunar X is a claire-obscure effect in which light and shadow creates the appearance of a letter “X” on the rim of the Blanchinus, La Caille and Purbach craters.