13th zodiac sign: Ophiuchus

Previously i used to be Sagittarius, but now i'm an Ophiuchus.
 Yes, according to these sources: huffingtonpost, cnn, there is a new zodiac to be considered if you believe in sidereal zodiac (the eastern system, in which constellations are considered for zodiac sign).

The new sign is that of Ophiuchus: which means 'the serpent bearer' in Greek. To know more about Ophiuchus, wiki link.
symbol:

REASON:

 Astronomer Parke Kunkle says that due to changes in the Earth's alignment the dates of many zodiac signs have changed. Kunkle says that as the Earth and Sun slowly move the signs gradually change, as expected.

The change didn't happen over night either. The 12 signs were designated to different periods of the year almost 3,000 years ago, when astrology began, and since then the Earth's position in relation to the sun has changed.

The New Dates:

Capricorn: Jan. 20 - Feb. 16
Aquarius: Feb. 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 - Aug. 10
Leo: Aug. 10 - Sept. 16
Virgo: Sept. 16 - Oct. 30
Libra: Oct. 30 - Nov. 23
Scorpio: Nov. 23 - Nov. 29
Ophiuchus: Nov. 29 - Dec. 17
Sagittarius: Dec. 17 - Jan. 20

sources: nbc, time