Illustration of a bipartite arc from Tycho Brahe's observatory at Uraniborg, Hven, Denmark (now Sweden). It was used for measuring small angular dista

---

Illustration of a bipartite arc from Tycho Brahe's observatory at Uraniborg, Hven, Denmark (now Sweden). It was used for measuring small angular distances between stars. 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.

---

Size: 3309px × 5289px
Photo credit: © LIBRARY OF CONGRESS/SCIENCE PHOTO LIBRARY/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -, 1500s, 16th, apparatus, arc, artwork, astronomiae, astronomical, astronomy, bipartite, brahe, brahes, century, diagram, historical, history, illustration, instauratae, instrument, instruments, measurement, mechanica, tycho, uraniborg