Aristarchus of Samos, Sir Thomas Heath http://www.google.co.kr/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwit_KLjnK_xAhULK6YKHYzCBGIQFnoECAgQAA&url=http%3A%2F%2Fwww.24grammata.com%2Fwp-content%2Fuploads%2F2013%2F06%2Faristarchus-24grammata.com_.pdf&usg=AOvVaw0yDS7FDndwW7CEjRRb2u9X Aristarchus of Samos 2021.06.24