- of or near the earth's equator
- of any equator
- like or characteristic of conditions near the earth's equator: equatorial heat
- designating or of a telescope mounted in such a way as to have two axes of motion, one (called polar axis) parallel to the earth's axis, the other (called declination axis) perpendicular to it: by rotation about the polar axis it can follow the apparent motion of a celestial body
- a. Of, relating to, or resembling the earth's equator.b. Relating to conditions that exist at the earth's equator: equatorial heat.
- Being or having a mounting with two perpendicular axes, one of which is parallel to the earth's rotational axis, allowing a telescope so mounted to track a celestial object for long periods with adjustments only to that axis.
(comparative more equatorial, superlative most equatorial)
- of, near, or relating to the equator
- That plant is best suited to equatorial climates.
- (astronomy) A kind of telescope mounted so 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, 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.