declination(redirected from declinational)
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1. A sloping or bending downward.
2. A falling off, especially from prosperity or vigor; a decline.
3. A deviation, as from a specific direction or standard.
4. A refusal to accept.
5. See magnetic declination.
6. Astronomy The angular distance to a point on a celestial object, measured north (in positive degrees) or south (in negative degrees) from the celestial equator.
[Middle English declinacioun, from Old French declination, from Latin dēclīnātiō, dēclīnātiōn-, from dēclīnātus, past participle of dēclīnāre, to turn away; see decline.]
1. (Astronomy) astronomy 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. Symbol: δ Compare: right ascension
2. (Navigation) See magnetic declination
3. a refusal, esp a courteous or formal one
dec•li•na•tion(ˌdɛk ləˈneɪ ʃən)
1. a bending, sloping, or moving downward.
3. deviation, as from a standard.
4. a polite refusal.
5. the angular distance of a heavenly body from the celestial equator, measured on the great circle passing through the celestial pole and the body.
[1350–1400; declinacioun < Old French declinacion < Latin dēclīnātiō <dēclīnā(re) (see decline)]
The position of a celestial object above or below the celestial equator. It is measured as a vertical angle, from 0° at the celestial equator to 90° at one of the celestial poles. Declination and right ascension are the measurements used to map objects on the celestial sphere. See more at celestial sphere, See magnetic declination.
The angular distance to a body on the celestial sphere measured north or south through 90 degrees from the celestial equator along the hour circle of the body. Comparable to latitude on the terrestrial sphere. See also magnetic declination; magnetic variation.
A star’s angular distance in degrees N or S of the celestial equator. Equivalent to the Earth’s latitude.
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|Noun||1.||declination - a condition inferior to an earlier condition; a gradual falling off from a better state|
condition, status - a state at a particular time; "a condition (or state) of disrepair"; "the current status of the arms negotiations"
disuse, neglect - the state of something that has been unused and neglected; "the house was in a terrible state of neglect"
twilight - a condition of decline following successes; "in the twilight of the empire"
wreck - something or someone that has suffered ruin or dilapidation; "the house was a wreck when they bought it"; "thanks to that quack I am a human wreck"
|2.||declination - a downward slope or bend|
downhill - the downward slope of a hill
incline, slope, side - an elevated geological formation; "he climbed the steep slope"; "the house was built on the side of a mountain"
steep - a steep place (as on a hill)
|3.||declination - (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|
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
angular distance - the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars"
|4.||declination - a polite refusal of an invitation|
acknowledgement, acknowledgment - a statement acknowledging something or someone; "she must have seen him but she gave no sign of acknowledgment"; "the preface contained an acknowledgment of those who had helped her"
refusal - a message refusing to accept something that is offered