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[524] These three Belts [Tropics of Cancer, Tropic of Capricorn, and the           are parallel, and at right angles to the Axis which they surround and which is the centre of them all, but the fourth [the Ecliptic] aslant is fixed athwart the Tropics: they on opposite sides of the Equator support it at either limit, but the Equator bisects it.