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Updated: May 11, 2025
The CASSINIS had neglected the Observatory in Paris; but when LALANDE was director of this establishment, he obtained from BONAPARTE good instruments of every description and of the largest dimensions.
Proper Motion. In 1718 Halley detected the proper motions of Arcturus and Sirius. In 1738 J. Cassinis showed that the former had moved five minutes of arc since Tycho Brahe fixed its position. In 1792 Piazzi noted the motion of 61 Cygni as given above.
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