Ascension. RIGHT, of a star, in astronomy, one of the factors in determining the location of a heavenly body. It corresponds nearly to longitude on the earth. The celestial equator divides the celestial sphere into northern and southern hemispheres. A certain point, the vernal equinox or first point in Aries, is established as a starting point. The right declination of any star is then found by measuring the angular distance on the celestial equator, from the fixed point to the foot of a circular perpendicular let fall from the star to the celestial equator. See DECLINATION.