Robert Stawell Ball

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Sir Robert Stawell Ball FRS (1 July 1840 – 25 November 1913) was an Irish astronomer who created the idea of screw theory. He served as Royal Astronomer of Ireland at Dunsink Observatory from 1874 to 1892, and he was Andrews Professor of Astronomy at Trinity College Dublin.

Born in Dublin, Ball was the son of naturalist Robert Ball and Amelia Gresley Hellicar. He studied at Trinity College Dublin, winning a scholarship in 1859 and becoming a respected student in mathematics and science. He worked for Lord Rosse from 1865 to 1867, then became Professor of Applied Mathematics at the Royal College of Science in Dublin. He was elected a Fellow of the Royal Society in 1873.

In 1874 Ball moved to Cambridge, becoming Lowndean Professor of Astronomy and Geometry and directing the Cambridge Observatory. He published The Theory of Screws (1876), laying out screw theory, a major contribution to kinematics. For this work he received the Cunningham Medal of the Royal Irish Academy in 1879. Ball also wrote popular science pieces and books for general readers, including A Glimpse through the Corridors of Time (1882) and The Story of the Heavens (1886).

Ball was knighted in 1886. His other notable works include Time and Tide: a Romance of the Moon (1889), The Cause of an Ice Age (1891), An Atlas of Astronomy (1892), A Treatise on the Theory of Screws (1900), and A Treatise on Spherical Astronomy (1908). He was internationally recognized and served as President of various scientific groups, delivering many lectures to popular audiences; estimates say he gave about 2,500 lectures between 1875 and 1910.

He died in Cambridge in 1913 and was buried there with his wife, Lady Francis Elizabeth Ball. They had several children: Frances Amelia, Robert Steele Ball, William Valentine Ball (later Sir), Mary Agnetta, Charles Rowan Hamilton, and Randall Gresley Ball (later Colonel). His legacy includes the minor planet 4809 Robertball named in his honor, and his influence on both professional astronomy and public science education remains noted.