Gradually, from Eratosthenes to Tycho, Hipparchus playing the most important part among ancient astronomers, the complex astrolabe was evolved, large specimens being among the chief observa tory instruments of the 15th, 16th and even 17th centuries; while small ones were in use among travellers and
The two forms of the planispheric astrolabe most widely known and used in the 15th, 16th and even 17th centuries were: (I) the portable astrolabe shown in fig.
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