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Thomas Hubbard Sumner (20 March 1807 – 9 March 1876) was a sea captain during the 19th century. He is best known for developing the celestial navigation method known as the Sumner Line or line of position. ==Biography== Thomas Hubbard Sumner was born in Boston on March 20, 1807, the son of Thomas Waldron Sumner, an architect, and Elizabeth, daughter of Thomas Hubbard, of Weston Massachusetts. Sumner was one of eleven children, four of whom died young. Of the seven that survived he was the only son. He entered Harvard at age fifteen. At the age of 19, shortly after graduating, he married and ran off to New York with a woman with whom he had become entangled but the marriage was short-lived and they were divorced three years later. He then enrolled as a common sailor on a ship engaged in the China trade and within eight years he had risen to the rank of captain and was master of his own ship. On March 10, 1834 he married Selina Christiana Malcolm, of Connecticut and between 1835 and 1848 together they had six children, two of whom died in their infancy. On November 25, 1837, Sumner sailed from Charleston, South Carolina, bound for Greenock, Scotland, and it was during that voyage, while entering the channel of Saint George and the Irish sea, that he discovered the principle upon which his new method of navigation was based. He took some years to perfect it and published it in the form of a short book in 1843. Shortly after that his mind began to fail and in 1850 he was committed to the McLean Asylum in Boston. His state gradually deteriorated and in 1865 he was committed to the Lunatic Hospital at Taunton, Massachusetts, where he died in 1876 at the age of 69. Two survey ships in the United States Navy have been named for him, USS ''Sumner''. Also, the crater Sumner on the Moon is named after him. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thomas Hubbard Sumner」の詳細全文を読む スポンサード リンク
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