This Sunday is Sun-Day - the day that Daf Yomi reaches the famous page of Gemara recording the dispute between the Sages of Israel and the non-Jewish scholars regarding where the sun goes at night. The Sages of Israel thought that it doubles back and passes behind the sky, which they related to their understanding of various Scriptural verses. The non-Jews said (correctly) that it passes on the other side of the world. And Rabbi Yehudah HaNasi concedes that the non-Jews appear to be correct.