Born: March 1693, Sherborne, Gloucestershire [Died] July 13, 1762. Chalford, Gloucestershire. British astronomer. Studied theology at Oxford University and became a parish priest (1719). He began studying astronomy under the guidance of his uncle, and was also friends with E. Halley. He was a member of the Royal Society (18), professor of astronomy at Oxford University (21), and director of the Greenwich Observatory (42). He discovered two types of periodic changes in the apparent positions of the stars through precise observations, and determined that one was due to the combined effect of the Earth's orbital speed and the speed of light (discovery of aberration, reported by the Royal Society in 1728), and the other was due to the change in the direction of the Earth's axis of rotation caused by the gravitational force of the Moon (nutation). He received the Copley Medal from the Royal Society in 1748. Bradley |
[生]1693.3. グロスターシャー,シャボーン [没]1762.7.13. グロスターシャー,チャルフォード イギリスの天文学者。オックスフォード大学で神学を学び,教区牧師となる (1719) 。叔父の指導によって天文学研究を始め,E.ハレーとも親交があった。ロイヤル・ソサエティ会員 (18) ,オックスフォード大学天文学教授 (21) ,グリニッジ天文台台長 (42) 。精密観測によって発見した恒星の見かけの位置の2種の周期的変化のうち,一方が地球の公転速度と光速度との合成効果によるものであり (光行差の発見。 28年にロイヤル・ソサエティ報告) ,他方が月の引力による地球自転軸の方向変化 (章動 ) によるものであることを突止めた。 1748年ロイヤル・ソサエティからコプリー・メダルを受ける。 ブラッドリー
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