Earl of Londonderry extinct on the death of his great-grandson, the fourth Earl, in 1714. The second creation came in 1726 in favour of the soldier and politician Thomas Pitt, 1st Baron Londonderry. He had already been created Baron Londonderry in 1719 and was made Viscount Gallen-Ridgeway at the same time as he was granted the earldom, also in the Peerage of Ireland. He was the husband of Lady Frances Ridgeway, daughter and heiress of the fourth Earl of the first creation. A member of the prominent Pitt family, he was the uncle of William Pitt, 1st Earl of Chatham. His younger son,
Earl C. Slipher Slipher on the Moon is named after Earl and Vesto Slipher, as is asteroid 1766 Slipher, discovered September 7, 1962, by the Indiana Asteroid Program. Earl C. Slipher Earl Charles Slipher (; March 25, 1883 – August 7, 1964) was an American astronomer. He was the brother of astronomer Vesto Slipher. Slipher was born in Mulberry, Indiana. He first joined Lowell Observatory in 1908 and became a noted planetary astronomer, concentrating on Mars. He published "Photographic History of Mars (1905-1961)". In 1957, he appeared in the "Mars and Beyond" episode of "Disneyland" discussing the possibility of life on Mars. He