declination - noun

a condition inferior to an earlier condition; a gradual falling off from a better state

a downward slope or bend

(astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere

a polite refusal of an invitation

declination - thesaurus

dec   declension   decline   declivity   descent   downslope   fall   regrets