On September 17, 2014, the sun exits the constellation Leo and enters the constellation Virgo. The sun will remain in front of the constellation Virgo the Maiden until it enters the constellation Libra the Scales on October 31.
When the equinox arrives on September 23, 2014 – bringing autumn to the Northern Hemisphere and spring to the Southern Hemisphere – the sun will be in front of the constellation Virgo. And so it has been for thousands of years.
However, over the long course of time, the sun hasn’t always been in front of Virgo at the northern autumnal equinox. And, what’s more, the sun won’t remain in front of this constellation at the September equinox, indefinitely.
It was in the year 730 B.C. that the Northern Hemisphere’s autumnal equinox sun passed out of the constellation Libra and into the constellation Virgo. Looking into the future, the September equinox sun will cross over into the constellation Leo in the year 2439. These dates are based upon the constellation boundaries as defined by the Astronomical Astronomical Union in the 1930s.
Relative to the backdrop stars, the March and September equinox points shift about one degree westward along the ecliptic in 72 years, or 30o westward through the constellations of the Zodiac in about 2,160 years.
In our day and age, the sun annually passes in front of the constellation Virgo from about September 17 until October 31.
Bottom line: On September 17, 2014, the sun exits the constellation Leo and enters the constellation Virgo. The sun will stay in Virgo until it enters Libra on October 31.