It is a division of the celestial sphere into 12 parts, originating from Ancient Greece or even from Babylon, linking them to certain constellations. They can be divided into some groups according to elements and modality.
Each zodiac sign belongs to one of four elements. Each element represents one of the 4 essential types of energy acting in each of us.
Fire signs: Aries, Leo, Sagittarius. Passionate, dynamic, active, straightforward, extraverted.
Earth signs: Taurus, Virgo, Capricorn. Grounded, realistic, practical, loyal.
Air signs: Gemini, Libra, Aquarius. Friendly, mental, analytical, communicative.
Water signs: Cancer, Scorpio, Pisces. Emotional, sensitive, mysterious, introverted
Cardinal signs: Cancer, Libra, Capricorn. Leaders.
Fixed signs: Leo, Scorpio, Aquarius, Stable.
Mutable signs: Virgo, Sagittarius, Pisces. Adaptive.
Signs are ruled by planets which have a strong position in this particular sign.
Aries is ruled by Mars,
Taurus – by Venus,
Gemini – by Mercury,
Cancer – by Moon,
Lion – by Sun
Virgo – by Mercury (and Proserpina)
Libra – by Venus (and Chiron)
Scorpio – by Pluto
Sagittarius – by Jupiter
Capricorn – by Saturn
Aquarius – by Uranus,
Pisces – by Neptune.