declination
dec-li-na-tion
noun
An angular deviation, especially between magnetic north and true north, or a celestial body and the celestial equator.
"Navigators must account for magnetic declination."
Thesaurus
Synonyms: decline, downslope, fall, declension, declivity, descent, dec, celestial latitude, regrets
Antonyms: acclivity, ascent, climb, improvement, melioration, raise, rise, upgrade