Name given to two imaginary circles. The terrestrial
Equator lies midway between the North Pole
and South Pole
and is the zero line from which latitude
is measured. It divides the Earth
into the Southern and Northern Hemispheres. The celestial
equator lies directly above the Earth's Equator, and is used as a reference to determine the position of a star using the astronomical co-ordinate system of right ascension and declination.
e·qua·tor / iˈkwātər/ •
n. an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°. ∎ a corresponding line on a planet or other body.
equator great circle
of the celestial sphere
XIV; great circle
of the earth XVII. — (O)F. équateur
or medL. æquātor
, in full circulus æquator diei et noctis
circle equalizing day and night. f. æquāre
See also 133. EARTH ; 178. GEOGRAPHY
- two points on the surface of the earth diametrically opposite each other. —antipodean , n. , adj.
- Antiscians, Antiscii
- persons living on opposite sides of the equator but in the same longitude whose shadows at noon fall in opposite directions.
a line notionally drawn on the earth equidistant from the poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°. The term is recorded from late Middle English, and comes from medieval Latin aequator
, in the phrase circulus aequator diei et noctis
‘circle equalizing day and night’.