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Equator

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Dictionaries
Webster Dictionary
• Equator
• Equation
• Equating
•   (only first 3 shown)
Encyclopedias
1911 Encyclopedia Britannica
• Equation
• Equation of the Centre
• Equation of Time
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The Nuttall Encyclopedia
• Quadratic Equation

(1):

(n.) The great circle of the celestial sphere, coincident with the plane of the earth's equator; - so called because when the sun is in it, the days and nights are of equal length; hence called also the equinoctial, and on maps, globes, etc., the equinoctial line.

(2):

(n.) The imaginary great circle on the earth's surface, everywhere equally distant from the two poles, and dividing the earth's surface into two hemispheres.