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The Yerkes 40 inch refractor telescope - 1897

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: 1 September 2019
10-Jul-2020 01:18 UT

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