Plural of 'equator'; multiple imaginary lines that divide celestial bodies or geographic regions into equal northern and southern parts.
From Latin 'aequator' (one who makes equal), the medieval astronomical term for the great circle equidistant from the poles. Plural formed with '-s'.
Jupiter has multiple 'equators' depending on whether you measure by gravity or rotation—the giant planet bulges at its equator and spins so fast that different latitudes rotate at different speeds.
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