He was not a theoretician; he was, however, a gifted observer and his indisputable discoveries are sufficient to win him a high position among the astronomers of the pre-Newtonian generation.
Siya ay hindi isang teoretista; siya, gayunman, ang isang likas na matalino tagapagmasid at ang kanyang hindi matututulan discoveries ay sapat na upang manalo siya ng isang mataas na posisyon sa hanay ng astronomers ng pre-ni Nyuton henerasyon.