Attached to the cross-arm which carries the microscopes used to observe the ends of the dipping needle is a clamp, which will hold the needle b in such a way that its plane is parallel to the vertical circle and its axis is at right angles to the line joining the two microscopes.
A vertical circle passing through the sun may also be seen.
Reflection from an excess of horizontal prisms gives rise to a vertical circle passing through the sun.
To the telescope the vertical circle for reading angles in This word has been a puzzle to etymologists.
the vertical circle.
The instrument is similar to that described above, except that the vertical circle is not continuous, but is formed of two arcs.
AZIMUTH (from the Arabic), in astronomy, the angular distance from the north or south point of the horizon to the foot of the vertical circle through a heavenly body.
In practice the vertical circle is adjusted once for all, so that when the levels k and l are in the centre of their run, the verniers read true zenith distances.
As regards the most general motion of a spherical pendulum, it is obvious that a particle moving under gravity on a smooth sphere cannot pass through the highest or lowest point unless it describes a vertical circle.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.