Oenopides was an ancient Greek mathematician and astronomer from the 5th century BCE, notable for his contributions to the field of astronomy and possibly geometry. He is most famously associated with the development of the concept of the zodiac and for being one of the early figures to advocate for the use of a gnomon (a device for measuring the altitude of celestial bodies) in astronomical observations. His work likely influenced later scholars, including those in the Hellenistic period.
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