Keywords: Repeating circle.JPG en A repeating circle in a display cabinet in Argelander hall in Helsinki observatory Made by Utzschneider und Fraunhofer in 1823 fi Repetitioympyrä Helsingin observatoriossa Argelander-salin näyttelykaapissa Utzschneider und Fraunhoferin vuonna 1823 valmistama own MKFI 2012-12-01 Collections of the Helsinki Observatory Reflecting circles 2012 in Helsinki December 2012 in Finland Taken with Canon EOS 60D Taken with Canon EF-S 15-85mm F3 5-5 6 IS USM Utzschneider und Fraunhofer Files by User MKFI |