Contrary to how they are often portrayed, constellations are regions of the sky, not a certain pattern of interconnected stars. The sun appears to pass through these regions in the celestial sphere on a path called the ecliptic, which is the basis for the zodiac. In addition to the 12 famous constellations in the zodiac, the sun now passes through a 13th, called Ophiuchus. Some people consider Ophiuchus the 13th zodiac sign. Typically, though, the signs and their corresponding dates don't match up with the length of time that the sun actually passes under the constellation. For example, the sun is in Scorpius for only 7 days out of the year, and under Virgo for 45.
The 13th Zodiac Constellation, Ophiuchus
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