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2021-01-04 08:40:08
Horrebow, Petrus."
Clavis astronomiae sive astronomiae pars physica / Copernicus triumphans sive de parallaxi orbis annui tractatus epistolaris "
Copenhague, Joh.Nicolaus Lossius, 1730 & Ibidem, Sumptibus authoris (printed by Jo.Grammius), (1727). 4to. (19, 9x15, 5 cm.). 2 parts in 1 vol. [xii], 112, [12 index] & [ii], 58, [1 colophon, 1 blank] pp. With letterpress tables in the text & 2 folding plates (one to each part, drawn by the author). Contemporary laced vellum. (old marginal repair in one leaf, very light marginal waterstain in 2 leaves). A nice copy with ample margins. ¶ Peder Nielsen Horrebow (1679-1764), the son of a fisherman, worked as assistant to Ole Rmer at the University of Copenhagen and in 1714 he succeeded Rmer as professor of mathematics and director of the observatory. His papers and instruments were all destroyed in the great fire of 1728. Horrebow's ultimate goal was to measure stellar parallaxes and thereby demonstrate the correctness of the Copernican model of the solar system. In 1727 he published a small book wherein he claimed the goal was reached. (Dsb.Vi/p.513-14). The Clavis was first published in 1725. This is the first edition of Copernicus triumphans."
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