Telling time at night using a nocturnal. The hour

Telling time at night using a nocturnal. The hour is obtained by measuring the angular position of the imaginary line joining the pointers in the constellation of the Plough to the Pole Star. From Peter Apian Cosmographia, Antwerp, 1539

1539 Angular Antwerp Apian Constellation Cosmographia Imaginary Joining Measurement Measuring Nocturnal Obtained Plough Pointers Telling

Features In These Collections

> Contributors > WHA