Circumnavigator's Day. The day 'lost' or 'gained' by the navigator when date is altered on crossing the Date Line on W'ly or E'ly course (respectively).
Circumpolar. Term applied to a heavenly body that makes a diurnal revolution around pole of heavens without passing below horizon.
Cirrocumulus. An intermediate form of cloud often called 'Mackerel sky'. Formed by small, rounded masses of cloud.
Cirrostratus. High, tenuous cloud of uniform density. Often precedes a depression.
Cirrus. Feathery, fibrous, detached clouds, white in colour, that are formed by ice crystals at heights of five to seven miles.
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