Halley's 1717 evidence for stellar proper motion does not survive a modern re-analysis, and Jacques Cassini's 1738 measurement of Arcturus provides the first statistically significant detection.
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Why Halley did not discover proper motion and why Cassini did
Halley's 1717 evidence for stellar proper motion does not survive a modern re-analysis, and Jacques Cassini's 1738 measurement of Arcturus provides the first statistically significant detection.