declination

/ˌdɛklɪˈneɪʃən/
noun
  1. The angular distance of a celestial body north or south of the celestial equator.
    • Astronomers measure declination in degrees, minutes, and seconds.
    • The declination of the North Star is approximately 90 degrees north.
    • The telescope's mount is adjusted based on the declination of the target object.
  2. The angle between magnetic north and true north, also called magnetic declination.
    • The local declination is 10 degrees east, so you need to adjust your bearing.
    • Magnetic declination changes slowly over time and varies by location.
    • Hikers must account for magnetic declination when using a map and compass.
  3. A formal refusal or rejection.
    • Her declination of the invitation was polite but firm.
    • The committee received several declinations from potential speakers.
    • His declination of the award surprised many of his colleagues.
  4. A downward slope or bend; a decline.
    • The declination of the roof directs rainwater to the gutters.
    • There is a noticeable declination in the road just past the bridge.
    • The path followed a gentle declination toward the river.
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