Sect. 1. Tables of Astronomical Refraction. 462 Sect. 2. Discovery of the Velocity of Light.--Römer. 463 {20} Sect. 3. Discovery of Aberration.--Bradley. 464 Sect. 4. Discovery of Nutation. 465 Sect. 5. Discovery of the Laws of Double Stars.--The Two Herschels. 467
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