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Published online by Cambridge University Press: 14 August 2015
The Gill Transit Circle at the Cape Observatory has observed zones −40° −52° and −30° −40° of SRS and is now observing zone −52° −64°, which is 80% complete. In addition to fundamental stars selected to define the FK4 system in the zone of observation, clock stars and azimuth stars are also observed so that the observations can be subsequently referred to a more independent or fundamental system.