By David J. Eicher
The San Francisco mountains from the catwalk of the 61-inch Strand astrometric reflector, U.S. Naval Observatory, Flagstaff, Arizona, Feb. 9, 2015.
Related blog: A visit to the U.S. Naval Observatory, Flagstaff Station
Our community is FREE to join. To participate you must either login or register for an account.
Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.
Astronomy Magazine