In Western astrology, the astrological signs are derived from 12 constellations that lie within the ecliptic in the nighttime sky. The ecliptic is the Earth's orbital plane around the Sun. This orbital plane is shared by most Solar System bodies. The Zodiac is the imaginary path above and below the ecliptic in the nighttime sky in which all Solar System bodies trace through the nighttime sky through the course of a year.
The 12 constellations and astrological signs are Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces.
Astrological signs originated from both Sumerians and Babylonians. They believed that tracking stars and planets in the sky were a way to track where gods were in the sky. The ancient Egyptians contributed to this idea by recognizing patterns of stars made up of constellations and that some of these constellations lie within the path the Sun and "wandering stars" (we now know planets) appeared to move through the nighttime sky.
Even if you don't believe in astrology, your birthdate has significance, and your sign has significance in the nighttime sky. We encourage you to learn more about constellations, the Zodiac, and astrology at the Solar Republic Newsletter.