- Of, relating to, or resembling the earth's equator.
- Relating to conditions that exist at the earth's equator.
- 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.
- A telescope having an equatorial mounting.
- Of or pertaining to the equator: as, <em>equatorial</em> climates; the <em>equatorial</em> diameter of the earth is longer than the polar diameter.
- An astronomical instrument contrived for the purpose of directing a telescope upon any celestial object of which the right ascension and declination are known, and of keeping the object in view for any length of time notwithstanding the diurnal motion.
- In <em>crystallog.</em>, of or pertaining to the horizontal or lateral plane.
- 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 <altname>equatorial telescope</altname>.
- Of or pertaining to the equator; ; also, pertaining to an equatorial instrument.
- of, near, or relating to the <xref>equator</xref>
- A kind of <xref>telescope</xref> mounted so as to have two <xref>axes</xref> of <xref>motion</xref> at <xref>right angles</xref> to each other, one of them <xref>parallel</xref> to the axis of the <xref>Earth</xref>, and each carrying a graduated circle, one for measuring <xref>declination</xref>, and the other right <xref>ascension</xref>, or the hour angle, so that the telescope may be directed, even in the <xref>daytime</xref>, to any <xref>star</xref> or other object whose right ascension and declination are known.
- of or relating to conditions at the geographical equator
- of or existing at or near the geographic equator
- of or relating to or at an equator
- a telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it