An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known
Something that is equatorial is near or at the equator. the equatorial island with a hundred and twenty thousand people living there. adj. French Equatorial Africa Equatorial Guinea Republic of Equatorial Guinea
of or existing at or near the geographic equator; "equatorial Africa" of or relating to conditions at the geographical equator; "equatorial heat" of or relating to or at an equator; "equatorial diameter