Medrash Tehillim quotes Shmuel as saying he is an expert in the streets of Nehardea as much as he is an expert in the ‘streets’ of the heavens. The Medrash asks how Shmuel knew all of that, and it answers he knew it all through the Torah. It then quotes a R’ Hoshea as saying there is “space” between the upper waters and the firmament, and the Medrash asks how R’ Hoshea could know this unless he traveled to space. It answers, he knew it from the Torah.
Regarding Ptolmey himself, the Abarbanel (Shmos 12) quotes Ptolmey as being so impressed with the Jews’ astronomical calculations, that he said it proves the Jews had prophecy. In the Sefer Eretz Zvi (by Rav Aryeh Zvi Fromer ZTL, Rosh Yeshiva in Chachmei Lublin), quotes more such sources about Ptolmey.