The Yerkes 40 inch refractor telescope - 1897
Date: 01 December 2013
The 40-inch (102 cm) refractor telescope at Yerkes Observatory, Wisconsin, USA, was used by Frank Schlesinger for parallax measurements.
Last Update: 23 September 2021
ESA Science & Technology - The Yerkes 40 inch refractor telescope - 1897
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Date: 01 December 2013
20-Feb-2025 19:30 UT
