First and Foremost Revelation 12 is a symbolic summery of all History, where The Woman is Israel, the Man Child is Jesus and/or The Church, and The Dragon is Satan. And the third of the stars The Dragon caused to fall to The Earth I don't think accounts for all Fallen Angels, but specifically those from Genesis 6. Because the Angels fighting with The Dragon latter haven't fallen form Heaven yet, they're still up there with the Dragon.
But it's also possible, When John Says he saw a Wonder in heaven, that it could be referring to signs seen in the Heavens at this time. The Greek Texts has no Chapter breaks, this is still the outcome of the Seventh Trumpet.
Kai (Strong# 2532) the Greek for "and" used at the start of Verse one, can also mean "also", even" "then" and so on. This is a Wonder seen right after or during all the events of the Seventh Trumpet.
I'm well aware there are a lot of dangerous ideas linked to the Mazzaroth and Gospel in The Stars theories. But I still think they're worthy of study. And I think Jupiter's conjunction with Regulus on September 11th 3 B.C. was the Star of Bethlehem.
Thing is, unlike a lot of people delving into the possible Astronomical implications of Revelation 12, I don't think there is anything here sufficient to tell us what year it happens, just the time of year.
First question, why choose Virgo for The Woman? Yes being a Virgin fits other Biblical themes but Revelation 12 itself uses no word for Virgin, and there are other Constellation that are represented as female personages.
The main reason is that Virgo is the only female one that is part of the Zodiac, so only she can have the Sun and Moon pass through her, that is what makes the Zodiac Constellations different from the others, they're the ones the Sun, Moon and Planets pass through.
The Sun and Moon both being in some way in the same constellation means it's an event on or near a New Moon, because the New Moon is when the Moon is as close as it gets that monthly cycle to The Sun, that is why Solar Eclipses always happen on New Moons. Virgo is the longest Constellation, so generally two New Moons happen in Virgo every year. The Moon being specifically under Virgo's Feet places it right at the end of the Moon's travel through Virgo, so generally 1 or 2, or maybe 3 days after the New Moon.
Almost always, the New Moon of Tishri (The Feast of Trumpets/Yom Teruah) occurs while they are in Virgo. That fits with this following the Seventh Trumpet, because the First of Tishri is also affiliated with the Last Trump.
A day or two after the First of Tishri is interesting, this could be Tzom Gedalya, the Third of Tishri. One of Four major Fast Days of the Jewish Calendar. Zachariah 8:18-19 foretells that all four major Fast Days will become Joyous celebrations. Maybe one of those will be the day of The Rapture. Tishri is in the Seventh Month here, because God uses the Holy Calendar which begins with Nisan.
You may be thinking, "Virgo isn't even visible in the Night Sky when the Sun is in her". Normally yes, but if we're at the time of the Rapture for this particular New Moon or soon after, Jesus said in Matthew 24:29 "Immediately after the tribulation of those days shall the sun be darkened, and
the moon shall not give her light, and the stars shall fall from heaven, and the
powers of the heavens shall be shaken:". Contrary to Pre-Wrath conjecture this is incompatible with the Sixth Seal. But Stars fall from Heaven in Revelation 12 as well. And if the Sun and Moon are darkened, then perhaps unlike normal circumstances the Constellations will be visible during Daytime hours.
Full Moons, as an interesting side note, are the opposite, they are when the Moon is farthest from the Sun, the other side of the Earth. Why Lunar Eclipses are always on Full Moons. The Full Moon that begins Tabernacles in Tishri generally happens while the Sun is in Virgo and the Moon in Aries, The Ram. The Full Moon linked to Passover is while the Sun is in Aries and the Moon in Virgo, usually under her Feet. I looked and the Passover of 30 AD when I believe the Crucifixion happened is no exception. Rams are a Levitically clean animal, used in Temple Sacrifices. They're related to Lambs, and I bet some less well known forms of the Zodiac have used a Lamb instead of a Ram for that Constellation. So it's an interesting one to be linked to Passover.
Now one thing considered necessary to narrow this down is one of the Planets being in her (usually Jupiter is the favored one) and probably about to leave. To represent the Man Child in her Womb. But this isn't really rare at all, a planet (sometimes more then one) is almost always there when this happens. This years (2014) Yom Teruah (which begins at Sunset September 24th), Mercury and Venus will both be there. Venus will go through it rather quickly, Mercury will stay awhile.
Jupiter is favored because it's the Planet of Kingship. The star that was in Conjunction with Regulus of Leo to be the Star of Bethlehem in one popular theory. And it usually spends 9 months to a year in roughly the womb area of Virgo, depending on how you define when it enters and exits. But Jupiter leaves Virgo every 12 years. A lot of attention is paid to when Jupiter will leave Virgo in September of 2017. But it will happen again 12 years later, only lacking certain details of the 2017 event deemed important by it's proponents, mainly Leo having 3 extra stars.
Leo is directly above the head of Virgo, and linked to Royalty. But is today viewed as a 9 star Constellation, so the assumption tends to be that you need to add 3 planets to make it fit being Virgos 12 star Crown. The overlooked historical detail is that Coma Berneicis was part of Leo in Ancient Times. Though it was already refereed to sometimes as a distinct sub portion of the Constellation, like Orion's Belt, it was not separated from Leo until Renaissance times.
The Coma is 3 stars as defined by Ptolemy. One of it's stars is even named Diadem, meaning Crown. So in Fact Virgo's 12 Star Crown is always there, you don't need any other more distinct event.
As attractive as the September 2017 event may look. I view The Seventh Trumpet as the middle of the 70th week. And I believe The 70th Week can't begin until The Temple is fully reconstructed. So it's too late now. Still I will pay attention as we approach that date, I'm prepared to be wrong.
October 9th/10th 2029 fits equally as many valid qualifications. I don't want to Date set on it either, but what's interesting is it's during the time when we will be living exactly 2000 years since the roughly year long ministry of Jesus Christ. The Tishri of 2029 will be the 2000 year anniversary of John 7.
Thing is, I don't think Jupiter or any Star being in Virgo is required at all to fit what this describes. The Man Child I don't think needs to be represented specifically by an astronomical object. It's simply that from the Christian view of the stars, the Woman is always inherently pregnant with The Man Child. In most views of the Mazzaroth, Spica is the Seed of The Woman.
So as I said before, these signs tell us the time of year, but not what year. Once The Week begins we'll be able to calculate what year, but not yet.
Update September 26th 2015: My thoughts have Revelation 12 have been adjusted quite a bit. Read this.