According to some videos, the "Revelation 12:1" sign is a specific configuration of Virgo, Leo, and Mercury, Venus, and Mars (The 9 stars of Leo plus the 3 planets making the 12 "stars") that last appeared in this specific configuration over 5,900 years ago (according to astronomy computer programs). 
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Does this mean that anything will happen on Sept 23? No. Even if it a "sign" that something will happen "soon," "soon" doesn't have to mean within a week, a month, or by the end of the year.
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Something "could" happen on Sept 23. But that is only a couple days away and we will find out then. But if nothing happens, that doesn't mean it is a complete bust. It could be a "sign" of a "coming event" that could happen "soon."
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But, Biblically speaking, the next "something" that both Christians and Jews (both) expect is the Daniel 9 prophesy of the "7-year peace treaty" Israel signs with "many" (whoever and whatever "many" might be).
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And Trump "hopes" for a treaty "by year's end."