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An agonic point is o location where a magnetic needle points North without declination.
An agonic line is a line on a chart or map showing points of zero magnetic declination.
solar altitude angle= (90 degree - zenith angle )
The declination of the constellation Gemini is +20.
Magnet declination is the angle between magnetic north and true north. Declination is considered positive east of truth north and negative when west.
Right ascension is 21 h and declination is −36°.
moons declination reachesonly 18° N or S each month..
Right ascension: 8-15 h Declination: −20°
Corvus the Crow is centered roughly on -20 degrees in Declination.
Assuming the subject is magnetic declination the difference between the north pole and the true north pole this difference, is the magnetic declination, there is not information on what purpose it serves.
It is important to take the declination into account when one is closer to the poles because declination varies more as a function of longitude and not the latitude. In North America, if one goes toward the east coast, the declination increases to the west. If one goes to the west coast, the declination increases to the east.
Right ascension: 8 h Declination: +5°
Right ascension: 21 h Declination: −20°
15 degrees, 27 minutes East declination.
Right ascension: 11 h Declination: +15°