The most recent date, 150 B.C. would correspond to the first proposal of orbits by the Greeks. Much earlier, the moon is proposed to be reflecting sunlight.
The main Jewish/Greek philosopher of the earlier period was Philo. And I believe he would have either written in Hebrew or Greek.
On top of the relatively new Greek ideas of reflected light and orbits, Enoch also includes several other curious statements (from my post above):
And then there is a reference to the end of all that there is (and beginning) which sounds like a singularity: in chapter 18 a place with no measure and no content, a pit "where the heavens come together." He records that the angel explained [v. 14] "this is the ultimate end of heaven and earth; it is the prison house for the stars and the powers of heaven…"
Of course, the first question in evaluating such a text is whether the peculiar information could have been known to the original scribe of Enoch and the next, how?
We need to look at the larger historical context. Alexander liberated Israel from the Persian empire around 300 BC, and from that point forward (well before the Enoch copy) the Jews traveled freely in the Greek world and many became culturally Hellenized. It's not remarkable that the ideas of one culture could have influenced the other. As for traveling around, the distances weren't all that great. A few days by ship. Not a big deal. I don't see any great historical paradox here.