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