Nautical words

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Chops of the Channel. Sea area immediately to westward of English Channel. First known use of this name was in 1748.

Chromatic Aberration. Deviation of light rays after passing through curved lens. Results in coloured fringes around observed objects, caused by unequal refraction of lenses breaking up light into its constituent colours.

Chromosphere 81 Circle of Perpetual Occultation

Chromosphere. Incandescent gaseous envelope surrounding Sun.

Chronograph. A watch combined with a stop-watch mechanism.

Chronometer. Very accurately constructed timepiece with a balance wheel of a form that precludes error through change of temperĀ­ature. Balance wheel is affected by mainspring for only a very small period of its oscillation. Invented by John Harrison about 1728.

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