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The Testimonia of Cleostratus of Tenedos are ancient reports about an astronomer of the sixth century BC, collected in Diels and Kranz's Fragmente der Vorsokratiker. Theophrastus says that he made observations of the solstices from Mount Ida; the geographer Scylax names Tenedos as his home; and other notices list him among the writers of Phaenomena and mention his Astrologia, apparently a poem on the stars.
These testimonies show how later Greeks remembered Cleostratus as a pioneer of astronomical observation, alongside figures such as Meton. They are brief, but they help to trace the beginnings of scientific astronomy in the Greek world before Eudoxus and Aratus.
About this edition. The Greek text comes from the Eulogikon open corpus of public-domain editions (standard reference: DK 6 A 1–4). Every word has been analyzed with odyCy, a neural language model for Ancient Greek — click or tap any word for its dictionary form, part of speech, and complete morphology, together with the full entry from the Liddell–Scott–Jones Greek–English Lexicon (LSJ).