Amplitude of an observed heavenly body

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Amplitude (of an observed heavenly body)

The angle subtended at the observer'ssecond zenith between two great circles of the celestial sphere perpendicular to the observer'ssecond horizon, one of which passes through the observed body and the other through the east and west points of the observer'ssecond horizon.

Please note that this is the term as it stands in the original IALAInternational Association of Marine Aids to Navigation and Lighthouse Authorities - AISM Dictionary edition (1970-1989)