Groombridge Transit Circle

Groombridge transit circle

Groombridge Transit Circle was a meridian transit circle made by Edward Troughton for the English astronomer Stephen Groombridge in 1806, which Groombridge used to compile data for the star catalogue, Catalogue of Circumpolar Stars.[1] The advantage of a transit circle over a mural circle (which can measure polar distances) is that it allows measuring right ascension and declination at the same time.[2]

It had an aperture of 3.5 inches and a 5-foot focal length, mounted inside two 4 foot circles on stone piers.[2] Groombridge used the instrument to determine the positions of over 4000 circumpolar stars.[2]

It was eventually bought by James South, and it remained at his observatory at Kensington until 1870.[2]

See also


  1. ^ Groombridge Transit Circle, 1820. -- Science and Society Picture Library
  2. ^ a b c d King, Henry C. (2003). The History of the Telescope. Cambridge, Massachusetts: Courier Corporation. pp. 234–6. ISBN 978-0-486-43265-6.

Further reading

This page was last updated at 2021-03-17 01:50 UTC. Update now. View original page.

All our content comes from Wikipedia and under the Creative Commons Attribution-ShareAlike License.


If mathematical, chemical, physical and other formulas are not displayed correctly on this page, please useFirefox or Safari