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Telling time at night using a nocturnal, 1539. 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
Method of measuring angles with a cross-staff, 1636. Edmund Gunter (1581-1626) was an English mathematician and astronomer who invented many measuring instruments which bear his name; Gunters Chain
Finding the angular distance between two edges of a wood using a cross-staff, 1617-1619. From Utriusque cosmi...historia by Robert Fludd. (Oppenheim, 1617-1619)
