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. [Please select]
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120) it had led to the successive inventions of the anaphoric clock and of the planispheric astrolabe. [Please select]
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The ordinary planispheric astrolabe, of course, was known in Islam from its first days until almost the present time. [Please select]
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