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ONE: TWO:James Bradley (b. 1692), who succeeded Halley as the third Astronomer Royal, held that post till 1762, when he died. He had in 1728 distinguished himself by his discovery of an unanswerable proof of the motion of the earth by his observations on the apparent alteration in the place of a fixed star. His second great discovery was that of the mutation of the earth's axis, showing that the pole of the equator moves round the pole of the elliptic, not in a straight but in a waving line. Bradley gave important assistance to the Ministry in their alteration of the calendar in 1751, and the vast mass of his[153] observations was published after his death, by the University of Oxford, in two volumes, in 1798.

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