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" "These <nowiki>[</nowiki>binary stars<nowiki>]</nowiki> may serve another very important end. ...Several stars of the first magnitude have been observed or suspected to have a proper motion; hence we may surmise that our sun, with all its planets and comets, may also have a motion towards some particular point of the heavens. ...If this surmise should have any foundation, it will show itself in a series of some years in a kind of systematical parallax, or change due to the motion of the whole solar system.
Sir Frederick William Herschel KH FRS (German: Friedrich Wilhelm Herschel) (15 November 1738 – 25 August 1822) was a German-born British astronomer, technical expert, telescope maker, organist and composer who became famous for discovering Uranus. He also discovered infrared radiation and made many other contributions to astronomy. His sister Caroline Herschel and son, Sir John Herschel, were also notable astronomers.
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The number of stands I invented for these telescopes it would not be easy to assign. ...In 1781 I began to construct a thirty foot aërial reflector, and having made a stand for it, I cast the mirror thirty-six inches in diameter. This was cracked in cooling. I cast it a second time, and the furnace I had built in my house broke.