urn:nasa:pds:context:telescope:lowell.21in0 1.0 1.11.0.0 Product_Context 2019-01-23 1.0 Initial version urn:nasa:pds:context:facility:observatory.lowell telescope_to_facility 0.5334 248.335556 35.202778 2210 Geodetic - North American (1927) Datum 21.0-in (53 cm) reflector telescope at Lowell Observatory, Mars Hill, Flagstaff, AZ, was built for Harold Johnson, in 1953. The telescope ushered in photoelectric astronomy at Lowell. The 21-in is the only manually slewed telescope at Lowell and is still in use with minimal upgrades since 1953.