Right ascension and declination coordinates are for the epoch J2000. The concentric circles the stars trace out are lines of celestial latitude, known as "declination". Its far northern declination makes it generally visible for observers in the northern hemisphere. The prefix is followed by the pulsar's right ascension and degrees of declination. The coordinates of the field are right ascension , declination (J2000). It was only possible to use this device to measure the declination of celestial objects. Its angle relative to true North is the "declination" () or "variation". An agonic line is drawn through points of zero magnetic declination. The magnetic declination at Nuuk is extreme. This heading differs from true north by the local magnetic declination. The Sun's declination varies with the seasons. Both dials need to output both time and declination. On his first voyage, he independently discovered the Americas and magnetic declination. One Gnostic mythos describes the declination of aspects of the divine into human form. Its declination will not be exactly zero either.