There are twelve signs of the Zodiac, each associated with a constellation. And each occupies a section in the sky 30 degrees wide.

The sun travels through the signs of the Zodiac in the course of one year, spending about a month in each. Your astrological sign is determined by the constellation the sun was "in" on the day you were born.

But a phenomenon called precession has had an interesting effect on astrology, and especially on astrological signs.