If you are one of those who check their horoscope daily, you might be reading the wrong one.  Astronomers now say that the moon's gravitational pull on the Earth knocked the stars out of alignment by a month.  Not only that, but there is now a 13th sign.

Below are the new dates associated with each sign, including the new one, Ophiuchus.

Capricorn: January 20 - February 16
Aquarius:
February 16 - March 11
Pisces:
March 11 - April 18
Aries:
April 18 - May 13
Taurus:
May 13 - June 21
Gemini:
June 21 - July 20
Cancer:
July 20 - August 10
Leo:
August 10 - September 16
Virgo: September 16 - October 30
Libra:
October 30 - November 23
Scorpio: November 23 - November 29
Ophiuchus:
November 29 - December 17
Sagittarius: December 17 - January 20

The ancient Babylonians originally had 13 constellations, but they only wanted 12, so they threw out Ophiuchus, the snake holder.  Libra was not even around until the Julius Caesar era.

Get more details here.