Bonetus de Latis or Jacob ben Emanuel Provenzale was a French physician and astrologer of Jewish origin.
Originally from Provence, France, he was a rabbi, and in Rome became physician to Pope Alexander VI and later Pope Leo X. Latis is known mainly as the inventor of the ring-shaped sundial, an astronomical circular dial that could be used to measure solar and stellar altitudes and determine the time with great accuracy both day and night. These clocks were portable and easy to use for navigation. Latis also wrote a treatise known among scholars about the astrolabe ring (1492-1493).
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