Keywords: Sekstantti 1816.jpg Troughton sextant from 1816 in Helsinki observatory fi Troughtonin sekstantti vuodelta 1816 Helsingin observatoriossa own MKFI 2012-12-01 Collections of the Helsinki Observatory Sextants 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 Files by User MKFI |