al-Battani
... that al-Battani was one of the first astronomers to observe that the distance between the Earth and the Sun varies during the year?
... that <b id="mwBHM"><a href="./Al-Battani" id="mwBHQ" rel="mw:WikiLink" title="Al-Battani">al-Battani</a></b> was one of the first astronomers to observe that the distance between the Earth and the Sun varies during the year?