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De Mercurio die XI. Novembris A. MDCCXXXVI. sub sole viso narratio ad philosophiae et liberalium artium candidatos

First edition of a treatise on the transit of Mercury of 1736 by the Wittemberg professor of mathematics, author of the first complete history of astronomy and several other scientific publications. Weidler compares his observations with those of his predecessors, from Kepler to Halley, who in St. Helena first observed a transit of Mercury, realizing as he did so that if a sufficient number of astronomers in different locations round the world also timed their observations and then compared notes, it would be possible to derive the distance both of Mercury and of the sun. Weidler observed from his own home, using a reliable pendulum clock and two smaller clocks, a nine-foot telescope, two four-foot telescopes, and a helioscope. He compares his findings with the Rudolphine tables and more modern data, and describes the colour and apparent size of Mercury.

ID: 2000-00278
Weidler, Johann Friedrich

Creation Jan. 1, 1737 through Dec. 31, 1737


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