Bessel
/ˈbesəl/- Bessel, Friedrich Wilhelm (1784-1846), German astronomer and mathematician. He determined the positions of some 75,000 stars, obtained accurate measurements of stellar distances, and following a study of the orbit of Uranus, predicted the existence of an eighth planet.贝塞尔, 弗里德里希·威廉(1784-1846, 德国天文学家、数学家, 确定了约75,000个恒星的位置, 掌握精确测量恒星间距的方法, 并在研究天王星运行轨道后预测了第八颗行星的存在)。