English Ignazio Calandrelli Cited by user Shyamal on 11 May 2022 Ignazio Calandrelli (22 November 1792 – 12 February 1866) was an Italian priest and observational astronomer.
English Johann Georg Repsold Cited by user Shyamal on 21 Oct 2021 Johann Georg Repsold (19 September 1770 – 14 January 1830) was a German astronomer and fireman.
English Potsdam Great Refractor Cited by user Fotaun on 01 Nov 2019 Potsdam Great Refractor is telescope with a lens, completed in 1899 in Potsdam, Germany.