Greetings. I can answer that for you. Some people believe that certain passages in the bible, and I have Revelation 12:1 in mind, are suggestive of an astronomical position. While the woman, the sun, moon and crown of stars have a symbolic significance for sure regarding characters, the timing of that event is also suggested by the fact it mentions the position of the sun and the moon. There's only one woman the sun passes through, and that's Virgo (the other 11 constellations are not a single woman). So the sun is in the midst of Virgo. The moon is under her feet toward the direction of Libra so that's a new crescent moon. This happens at the feast of Trumpets, in September, but not every year. That is because a Jewish year begins with the new moon, which is not exactly 365 days in 12 or 13 lunar months to a year. So sometimes the feast occurs when the sun is a little off from the proper position in Virgo.
Now for the prophecy... so-called. People use programs like Stellarium to find out which years this fits the best. Actually, the position occurs quite often and 2011 was one of those years if I remember correctly. So on candidate years, they make those predictions. My two cents is that this occurred when Christ was born, so using that I came up with my own candidate year Christ was born (amongst other numbers and timings in the bible). I can understand your reservation not to use astrology, as that's Satan's corruption of the signs and timing in the heavens. However, Genesis 1:14 clearly indicate that they are to be used as such for God's timing of the feasts and even prophetic events. Look at it this way: these astronomical positions do not "foretell" anything. They are merely God's "giant clock hands" in which he announces certain events by, just as you use clock hands to tell you when it's time for an appointment. The clock predicted nothing,