Synonyms of 'declination'
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A descent is a surface that slopes downwards, for example the side of a steep hill.
On the descents, cyclists freewheel past cars.
Thesaurus for declination from the Collins English Thesaurus
the angular distance, esp in degrees, of a star, planet , etc, from the celestial equator measured north ( positive ) or south ( negative ) along the great circle passing through the celestial poles and the body