Aristarchus of Tegea was a contemporary of Sophocles and Euripides, who lived to be a centenarian, to compose seventy pieces and to win two tragic victories. Only the titles of two of his plays, with a single line of the text, have come down to us, though his Achilles was freely borrowed by Ennius. Among his merits seems to have been that of brevity; for, as Suidas relates, he was "the first one to make his plays of the present length." A Roman bust of Sophocles. ... Euripides (c. ... For other uses, see Achilles (disambiguation). ... Quintus Ennius (239 - 169 BC) was a writer during the period of the Roman Republic, and is often considered the father of Roman poetry. ... Suda (Σουδα or alternatively Suidas) is the name of a massive medieval lexicon, not an author as was formerly supposed. ...
According to Aetius, as cited here, "Aristarchus sets the Sun among the fixed stars and holds that the Earth moves round the sun’s circle (i.e., ecliptic)".
That would mean that Aristarchus recognized the sun as a star, and possibly the stars as suns (as did Democritus).
It would also raise the question whether Aristarchus truly assumed the stars to be infinitely far away, as the sun obviously is not.