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Encyclopedia > Alvan Graham Clark

Alvan Graham Clark (July 10, 1832 – June 9, 1897), born in Fall River, Massachusetts, was an American astronomer and telescope-maker. He was the son of Alvan Clark. In 1862, while testing a new 18-inch refracting telescope he discovered Sirius B, the magnitude 8 companion of Sirius.


Reference

  • http://reference.allrefer.com/encyclopedia/C/Clark_Al.html





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AllRefer.com - Alvan Clark (Astronomy, Biography) - Encyclopedia (228 words)
Alvan Clark 1804–87, American astronomer and maker of astronomical lenses, b.
In 1846 the firm of Alvan Clark and Sons was established at Cambridgeport, Mass.; it became famous as the manufacturer of the largest and finest telescope lenses.
The younger Clark discovered a number of double stars as well as the companion star of Sirius.
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