Illustration of an astronomical sextant from Tycho Brahe's observatory at Uraniborg, Hven, Denmark (now Sweden). It was used for measuring the altitudes of stars (their angular heights above the horizon). Brahe (1546-1601) is considered the greatest astronomical observer of the pre-telescopic era. This illustration is from a 1602 edition of Tycho Brahe's Astronomiae Instauratae Mechanica (Astronomical Instruments). In this book, first published in 1598, he described the astronomical instruments he invented and used to make his astronomical measurements. | |
Licence : | Droits gérés |
Crédit: | SCIENCE PHOTO LIBRARY / LIBRARY OF CONGRESS |
Taille de l’image : | 3364 px × 5191 px |
Model Release : | Non requis |
Property Release : | Non requis |
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