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Clock drive mechanism in the pier of the German equatorial mount for the 8-inch refracting telescope at Aldershot Observatory.. In astronomy, a clock drive (also known as a sidereal drive or field rotator) is a motor-controlled mechanism used to move an equatorial mounted telescope along one axis to keep the aim in exact sync with the apparent motion of the fixed stars on the celestial sphere.
A large German equatorial mount on the Forststernwarte Jena 50cm Cassegrain reflector telescope. An equatorial mount is a mount for instruments that compensates for Earth's rotation by having one rotational axis, called polar axis, parallel to the Earth's axis of rotation. [1] [2] This type of mount is used for astronomical telescopes and cameras.
Ideally, this drive requires a 1 RPM stepper motor on a 1/4" 20 pitch drive rod, but for shorter exposures on a stable platform , a well designed type-4 barn-door tracker is supposed to produce very acceptable results even when manually advancing the drive in 15 or 10 second sequential steps in order to achieve one full revolution per minute.
In the 1890s the mount was able to accommodate the 28-inch, and was thus re-used. [1] Originally it was rotated by a clockwork drive powered by water, and later in the 20th century this was replaced by electric motor driven system. [1] In 1897 it was said that the clockwork water drive that "the water clock in general drives it with great ...
The dome tower and equatorial room are original save a motor drive which replaced the old rope and sheave method of rotating the dome. [6] As of September 2014, the motor drive was being serviced and the rope and sheave method was once again in use. In the center of the equatorial room is the 1896 12-inch (300 mm) refractor telescope.
A large portable Newtonian telescope on an altazimuth mount with a third equatorial axis platform mount consisting of a pivot and radius bearing surfaces.. An equatorial platform or equatorial table is an equatorial telescope mount in the form of a specially designed platform that allows any device sitting on it to track astronomical objects in the sky on an equatorial axis. [1]
The College Football Playoff got underway Friday but the main course is spread out through Saturday. Three first-round games will be played across three separate campus sites from State College ...
Both axes of a GoTo mount are driven by a motor and controlled by a computer. It may be either a microprocessor-based integrated controller or an external personal computer. This differs from the single-axis semi-automated tracking of a traditional clock-drive equatorial mount.
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