And check this: the second word .IMAGINARY line. And original meaning of equator.day n night.


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e·qua·tor
/ēˈkwādər/
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noun
noun: equator; plural noun: equators
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.
ASTRONOMY
short for celestial equator.
Origin
late Middle English: from medieval Latin aequator, in the phrase circulus aequator diei et noctis ‘circle equalizing day and night’, from Latin aequare ‘make equal’ (see equate)