|A zodiac chart: credits to minglecity.com|
The zodiac does not lie perfectly in a plane with the ecliptic. Due to this fact, the time of year traditionally corresponding to each zodiac sign does not correspond with that sign's constellation. It takes about 2000 years for the ecliptic to shift over one constellation. During the time of the ancient Babylonians, the sun rose against Aries during the spring equinox (which is considered the beginning of the zodiac.) However, throughout the next two millenniums it began to rise against Pisces and is now beginning to rise against Aquarius. The current astrological age is referred to as the Age of Aquarius. It will take around 26000 years for the ecliptic and the zodiac to line up perfectly again, according to astro.com. This difference between the sun's path and the zodiac has led to two forms of astrology: tropical astrology, which is based on the seasons in the year, and sidereal astrology, which is based on the actual positions of the stars. The sidereal zodiac has a thirteenth constellation, Ophiuchus, between Scorpio and Sagittarius. The tropical zodiac is used in Western astrology and is the zodiac used in horoscope charts. The sidereal zodiac is used in Indian and Vedic astrology.
The zodiac can be divided into three groups of four signs. Cardinal signs, Aries, Cancer, Libra, and Capricorn, represent the equinoxes and solstices and stand for dynamic change. Fixed signs, Taurus, Leo, Scorpio, and Aquarius, stand for stability. Mutable signs, Gemini, Virgo, Sagittarius, and Pisces, stand for more gradual change. Zodiac signs can also be divided into four groups of three signs: earth signs (Taurus, Virgo, and Capricorn,) air signs (Gemini, Libra, and Aquarius,) fire signs (Aries, Leo, and Sagittarius,) and water signs (Cancer, Scorpio, and Pisces.) Additionally, zodiac signs can be divided into male and female groups.
Birthday shoutouts to Joseph and Uncle Andrew