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Perhaps that it's Hipparchus that you have in mind. Although he supposedly wrote fourteen works, the only one of his texts that we still have is Commentary on the Phaenomena of Eudoxus and Aratus, which consists of a highly critical commentary in the form of two books on a popular poem by Aratus based on the work on Astronomy by Eudoxus.
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If you're unsure whether the poet himself was from Magna Grecia perhaps Lucretious fits the bill? He is a Roman poet adapted what was known at the time of the work by Democritus, Leucippus and Epicurus into De Rerum Natura (On the Nature of Things), a Latin poem written in the first century BC. He is known as a poet but given he wrote this, one might as well call him a philosopher too - or a philosopher-poet.