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Cloud ceiling: altitude of the base of the clouds, expressed in meters.

See measure of cloud ceiling in : french | spanish

Spotlight whose point of luminous impact on a cloud serves as a reference for an alidade or theodolite sighting.

Instrument used to measure angles whose intervals indicate the height of a given point in relation to another.

Instrument whose sighting axis, by moving along a calibrated circle, measures a cloud’s angle in relation to the horizon, and thus its height.