The Astronomical Observatories of Jai Singh c15.s3.3

c15.s3.3

77. The European instruments, at the beginning of the seventeenth century, were, in principle, much the same as those used by the Greeks and Arabs. Tycho Brahe³ (1546-1601) had several sextants and quadrants, a parallacticum (see p. 82), and armillary circles; Hevelius (1611-1687) had a somewhat smaller battery of similar instruments; and Flamsteed (1646-1720) used a quadrant of 3 feet and a sextant of 6 feet radius.