Revelation 12:1-2
And there appeared a great wonder in heaven; a woman clothed with the sun,
and the moon under her feet, and upon her head a crown of twelve stars:
And she being with child cried, travailing in birth, and pained to be delivered.
In 3 B.C the constellation Virgo clothed with the sun as it entered the mid-body in its ecliptic course had the moon under her feet on one day only - Wednesday, September 11th. This configuration was visible in the Palestine area between 6:18 P.M. and 7:39 P.M. on that day. It was during this time period that Jesus Christ was born.
September 11, 3 B.C. fell on the first day of the month Tishri (the seventh month of the year according to the calendar given Moses following the exodus from Egypt.) Prior to the exodus, Tishri was the first month of the year and "Rosh Hashanah" or New Year's Day is still celebrated in modern Judaism on this day. It is believed that the first day of the first year was the day that the first Adam was formed, made and created by God. Jesus Christ, the second Adam, was born on this same day in 3BC.
"During the whole of New Year's Day [Tishri 1], trumpets and horns were blown in Jerusalem from morning to evening." - Alfred Edersheim - The Temple: Its Ministry and Services.
On Tishri 1 [September 11, 3 B.C.] while trumpets were blowing in Jerusalem to honor God and welcome the new year, in the small nearby town of Bethlehem the promised Christ who would reconcile men to God was being born. The religious and political leaders of the day were occupied with their own affairs and unaware of the significant event that was occurring.
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Poster Comment:
The birth of Jesus Christ - September 11, 3 B.C.
http://www.believerlinks.com/cortright/birth.htm
The Birth of Jesus and the Day of Trumpets
The historical evidence I have presented in this book shows that Jesus was born in the year 3 B.C.E. It appears most probable that a late summer birth in 3 B.C.E. has the best credentials. I need not rehearse my reasons for this, but they are very strong. Indeed, the evidence from the priestly courses alone suggests that a September nativity is the most likely. This gives a pretty close approximation that most scholars would probably accept as reasonable. But now, we come to the nitty-gritty! To propose an early evening birth on September 11, 3 B.C.E. appears almost impossible to believe. To get that close to his time of birth might at first seem to be fanciful.
The fact is, however, I can state without a shadow of a doubt, that the celestial scene described by the apostle John in Revelation 12:1–5, if viewed astronomically, would center precisely on a New Moon date within mid-September, and that in 3 B.C.E. that exact celestial phenomenon would have occurred in the early evening of September 11th. I can also state with assurance that sundown on September 11, 3 B.C.E. was also the beginning of the Jewish New Year (Rosh ha-Shanah ― The Day of Trumpets).
Even if the apostle John were only giving the symbolic time for Jesus’ nativity, and not the actual, we are provided with a great deal of insight on how early Christians interpreted significant periods of time on the holy calendar of Israel. If Jesus were actually born on Rosh ha-Shanah (the Day of Trumpets) in 3 B.C.E., a most impressive astronomical panorama of events burst forth on the scene that would have awed and astonished most Jewish people who lived at the time. Truly, this is not an exaggeration....
http://askelm.com/star/star008.htm