Deferens, bearing down), in ancient astronomy, the mean orbit of a planet, which carried the epicycle in which the planet revolved. [Please select]
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This he called the evection, and introduced another epicycle to represent it. [Please select]
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Epicycle: A point moving on the circumference of a circle whose centre describes another circle, traces an epicycle with reference to the centre of the second circle. [Please select]
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