Tycho's 1588 Revolving Steel Quadrant

Revolving steel quadrant, 2 meters in radius. Built in 1588. Estimated accuracy of 36.3 seconds of arc.

Bibliography:

Thoren, V.E. 1973, Journal for the History of Astronomy, 4, 25.

Wesley, W.G. 1978, Journal for the History of Astronomy, 9, 42.

Tycho