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WHen we know one of the Angles, which is made by a Right Line falling on another Right Line, we know also the other, as for instance, let EDB be 70 degrees, take away 70 degrees from 180, there remains EDG 110. The Practice of this is often of use in Trigonometry; and also in Astronomy, to find the excentricity of the Circle, which the Sun describeth in his Annual motion.