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. The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. Called also an equatorial telescope.

A telescope mount which features an axis parallel to the axis of rotation of the Earth, so that a simple rotation of the telescope around that axis allows it to follow the stars.

Eq -- A special kind of telescope mount that has its axes tilted up to match the latitude of your observing site and is pointed at the North (or South below the equator). When this type of mount moves it sweeps the sky in the same arcs that the stars appear to follow. This design makes it easy for the telescope to track stellar objects. A simple 24hr clock drive can make observing very easy.

With reference to planes of molecules, equatorial applies to any substituent that lies equatorially (or approximately so) in the plane of the molecule.

The three positions in a trigonal bipyramid that lie in the trigonal plane. See axial.

of or relating to or at an equator; "equatorial diameter"

of or relating to conditions at the geographical equator; "equatorial heat"

of or existing at or near the geographic equator; "equatorial Africa"

Of or pertaining to the equator; as, equatorial climates; also, pertaining to an equatorial instrument.

climate noted for rain in all seasons element - in chemistry, any substance made up of atoms having the same atomic number.