Steel sextant by one observer, Illustration of a steel sextant for measuring distances by a single observer from the 17th century, Fig. 17, p. 60, 1602, Tycho Brahe: Tychonis Brahe Astronomiae instauratae mechanica. Noribergae [Nürnberg]: apud Levinum Hulsium, 1602

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Steel sextant by one observer, Illustration of a steel sextant for measuring distances by a single observer from the 17th century, Fig. 17, p. 60, 1602, Tycho Brahe: Tychonis Brahe Astronomiae instauratae mechanica. Noribergae [Nürnberg]: apud Levinum Hulsium, 1602

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