An equatorial mounting in which the top end of a fork mounting is supported by a large circular bearing resembling a horseshoe. The design has great stability and has been used for large telescopes, such as the 200-inch (5-m) Hale Telescope at Palomar Observatory.
- Cliffdenian
- Clifford, (Michael) Richard Uram (1952– )
- Clifford, William Kingdon (1845–79)
- CLIMAP
- CLIMAPP
- climate
- climate change
- climate classification
- Climate/Long-ranged Investigation Mapping and Predictions Project
- climate sensitivity
- Climate–Leaf Analysis Multivariate Program
- climatic change
- climatic climax community
- climatic geomorphology
- climatic optimum
- climatic station
- climatic zone
- Climatiiformes
- climatology
- climatostratigraphy
- climax community
- climax trace fossil
- climbing dune
- climbing film evaporator
- climbing-ripple cross-lamination