Reversible Transit Circle
6 inch Telescope (15 cm)
This telescope was for a long time the only active transit instrument in the Southern Hemisphere.
- Designed by David Gill. Became the pattern for most transit circles made since.
- This telescope was in continuous use for observing the planets and selected stars to provide a fundamental system of star positions which is the observational basis of dynamic astronomy, accurate geodesy and of the determination of stellar motions.
- Instrument was the main source for the southern portion of the Fundamental Katalog (FK4)
S.A.A.O. (used to be the Cape Observatory)
Aperture: 6 inch (15.24 cm)
Manufacturer: Troughton and Simms. [Laing, p.13.]
- Completed 1905 [Laing, p.29.]
- The instrument was modernised in 1950 and 1960 [Laing, p.17; p. 9.]
- Laing, J.D. (ed.), The Royal Observatory at the Cape of Good Hope 1820 – 1970 Sesquicentennial Offerings.
- Collins, P. & Moore, P.; Astronomy in Southern Africa, p79.
- Laing, J.D. (ed.), The Royal Observatory at the Cape of Good Hope 1820 – 1970 Sesquicentennial Offerings, p.13; p.17; p.29.
- Smits, P., A Brief History of Astronomy in Southern Africa. (Unpublished)