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declination

declination

3 9.9
How far north or south a star is from the sky's equator
  • noun
  • /ˌdɛklɪˈneɪʃən/
  • Specialized
translation icon : declinación
  • Interpretation of the celestial hemisphere is trivial from equatorial coordinates; that is, positive declinations are immediately associated with the northern hemisphere and vice versa.
  • declination in degrees
  • right ascension and declination
  • celestial declination

Examples

  • Every year on the winter solstice, our Sun has a declination of -23.5 degrees and a right ascension of 18 hours.

    Blog text (20)
  • The coordinates are celestial coordinates; right ascension is the celestial longitude and declination is the celestial latitude.

    Academic text (1990)
  • Obviously, it's not in the right ascension and declination on the sky.

  • The 16 is the pulsar's declination.

    Academic text (2001)
  • The declination was given as so many degrees from the North Celestial Pole.

    Academic text (1996)
  • The UV patterns vary with declination.

    Academic text (1996)
  • Do you mind checking right ascension 18 hours, 34 minutes; declination plus 38 degrees, 41 minutes?

    Fiction book (1997)
  • For New Yorkers, it doesn't rise high in the sky because of its southern declination at -41.48.

    Blog text (28)
  • For example, coordinates of right ascension and declination of celestial objects can be projected onto the dome.

    Academic text (1993)
  • The coordinates include right ascension and declination, which help astronomers locate celestial objects in the sky.

Synonyms

dec
vsdeclination
  • Specialized
9.9

An angle north or south of the sky's equator measured in degrees and used with right ascension to find objects

is the same measure but expressed with the preferred full name
celestial latitude
vsdeclination
  • Specialized
9.1

The angle that shows how far north or south a star is from the sky's equator, measured in degrees

is the same measure but is a different phrasing rather than the shorter form

Compounds

magnetic declination
  • Specialized
6.7

The angle between the direction a compass points and true north at a place

Surface Forms

declination singular
declinations plural

Morphology

declination = decline (semi-transparent) = decline + ation

The astronomical sense is historically related to 'bending' or 'sloping' but is a technical, specialized meaning that is not obvious to all learners from 'decline' alone.

Etymology

Declination comes from Latin parts de- 'away' and clinare 'to bend', giving the idea of 'leaning away'; in the sky this means how much a star 'leans' north or south from the middle line. So in astronomy declination measures how far a star is north or south of the sky's equator.