Triangular Sextant, about 1.6 meter in radius, built in 1582.
As Tycho's sextants grew in size, they became fixed instruments,
although Tycho's ingenious globe mount retained a lot of the
versatility of use of smaller, conventional portable sextants.
Thoren, V.E. 1973, Journal for the History of Astronomy, 4, 25.
Wesley, W.G. 1978, Journal for the History of Astronomy, 9, 42.
-Written and last revised 8 November 1998 by paulchar@ucar.edu.