An astronomical sextant designed by Tycho Brahe

An astronomical sextant designed by Tycho Brahe

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: An astronomical sextant designed and built by Tycho Brahe, the last of the great naked-eye astronomers. It was built in 1572, in the garden of a house in Augsberg, Germany. The instrument takes its name from the fact that the arc (labelled CB) is one sixth of a circle. It was used for measuring the altitudes of stars (their angular heights above the horizon). The illustration is a copy of one which appeared in Tycho's book Astronomiae Instauratae Mechanica, published in Wandesburgi in 1598.

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Keywords: astronomical, astronomy, brahe, equipment, historical, history of, instrument, sextant, tycho's instrument

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