There are actually 13 zodiac signs
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The 13th zodiac sign you are questioning about is Ophiuchus (the Serpent Bearer). It was left out of the traditional 12-month calendar by the Babylonians thousands of years ago in order to neatly divide the zodiac into 12 equal parts.
The Earth actually passes through 13 constellations in the sky (the ecliptic) instead of 12. However, the Sun spends varying amounts of time in each constellation.
To make things match their 12-month, moon-based calendar, the Babylonians chose to ignore Ophiuchus and assigned 30 days to each of the 12 signs we use today.
The Ophiuchus Chart
If the zodiac were adjusted to include the 13th sign, it would sit between Scorpio and Sagittarius, altering the standard date ranges:
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
Scorpius (Scorpio): Nov 23 – Nov 29
Ophiuchus: Nov 29 – Dec 17
Sagittarius: Dec 17 – Jan 20
