The Astrolabe was a hybrid of the planisphere and the dioptra, essentially an analog calculator capable of solving various astronomical problems. Theon of Alexandria wrote a detailed treatise on ...

The early Greek treatise on the astrolabe, by Philopon, and the Syriac treatise by Sabokt—both dating from the seventh century—will appear in English for the first time. Illustrations are ...

Here is an astrolabe of our horizon, and a little treatise to teach a certain number of conclusions appertaining to the same instrument. "Trust well that all the conclusions that can be found ...

Here is an astrolabe of our horizon, and a little treatise to teach a certain number of conclusions appertaining to the same instrument. "Trust well that all the conclusions that can be found ...

The identification of an eleventh-century Islamic astrolabe bearing both Arabic and Hebrew inscriptions makes it one of the oldest examples ever discovered and one of only a handful known in the ...

Here is an astrolabe of our horizon, and a little treatise to teach a certain number of conclusions appertaining to the same instrument. "Trust well that all the conclusions that can be found ...