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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.
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telescope clock used equatorial also telescopes one axis drives clock-driven drive sidereal mechanism motion fixed sphere history astronomy motor-controlled work
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| the 60-inch telescope at the Mount Wilson Observatory | instance of | Clock drives can be light and portable for smaller telescopes or can be exceedingly heavy and complex for larger ones | 0.80 | text |
| Clock drive | related to history | The | 0.60 | section |
| Clock drive | related to history | In China | 0.60 | section |
| Clock drive | related to history | Song | 0.60 | section |
| Clock drive | related to history | Su Song | 0.60 | section |
| Clock drive | related to history | Different | 0.60 | section |
| Clock drive | related to history | English | 0.60 | section |
| Clock drive | related to history | Robert Hooke's | 0.60 | section |
| Clock drive | related to history | Italian-French | 0.60 | section |
| Clock drive | related to history | Giovanni Domenico Cassini | 0.60 | section |
| Clock drive | related to history | George Graham | 0.60 | section |
| Clock drive | related to overview | Clock | 0.60 | section |
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