Centering Error. Sextant error due to centre of pivot not being at exact centre of arc. Error varies with altitude.
Centigrade Scale. Graduation of thermometer in which freezing point of water is 0° and boiling point is 100°. Is a modification of Celsius scale, and was introduced by Christin, of Lyons, in 1743.
Central Eclipse. Eclipse in which centres of the two heavenly bodies are exactly in line to an observer at a specified place.
Central Latitude. Angle at centre of Earth between plane of Equator and a line projected through observer. As Earth is not a true sphere this angle will differ from angle formed by downward projection of observer's vertical—which is the 'normal' latitude.
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