Brass azimuthal quadrant, 65 centimeters in radius.
Built in 1576 or 1577, this was one of the first instrument
built at Hveen, and was used for observations of the 1577 comet.
Estimated accuracy of 48.8 seconds of arc.
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.