1 In principle, quadrant and astrolabe are easy to use to establish latitude.
2 When I first navigated it was with an astrolabe and the moon.
3 The compass and the astrolabe - an instrument for reckoning latitude-hadbeen already invented.
4 The now indispensable sextant was but clumsily anticipated by the newly invented astrolabe .
5 This man used words as a master mariner would use compass and astrolabe .
6 The sail and the astrolabe , not even specks on the horizon.
7 Beginning with an astrolabe , this spiritual jaunt ended in the cafés of the Latin Quarter.
8 In the corner stood the complicated Ptolemaic astrolabe that had been used in Galileo's inquisition.
9 The astrolabe was used for navigation by the stars.
10 The other invention was that of the astrolabe .
11 This, in reality, is all the evidence to be found as to the ownership of the lost astrolabe .
12 Nevertheless, I got my astrolabe out from under the bed and did my sums just to be sure.
13 A graduated circle with sights, for taking altitudes at sea, was called an astrolabe in the 18th century.
14 Tell how an astrolabe was made.
15 There were other, more familiar instruments scattered about: a set of brass sextants, a large brass astrolabe , chisels, saws.
16 The astrolabe , which the Greeks had invented and used for astronomical purposes, also came into Europe through the Arabs.
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