Definition of equator:
- 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.
- 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.
Consequently, the weight of bodies being the less the farther they are from the centre of the earth, it was inferred that the region of the equator must be much more elevated than our own- much more remote from the centre; so the earth could not be an exact sphere.- "A Philosophical Dictionary, Volume 5 (of 10) From "The Works of Voltaire - A Contemporary Version"", François-Marie Arouet (AKA Voltaire) Commentator: John Morley Tobias Smollett H.G. Leigh.
- "Travels in China, Containing Descriptions, Observations, and Comparisons, Made and Collected in the Course of a Short Residence at the Imperial Palace of Yuen-Min-Yuen, and on a Subsequent Journey through the Country from Pekin to Canton", John Barrow.
- "A Boy's Voyage Round the World", The Son of Samuel Smiles.