The 12 Zodiac Signs in a Birth Chart

Aries is ruled by Mars, Taurus and Libra by Venus, Gemini and Virgo by Mercury, Cancer by the Moon, Leo by the Sun, Scorpio by Pluto (traditionally Mars), Sagittarius by Jupiter, Capricorn by Saturn, Aquarius by Uranus (traditionally Saturn), and Pisces by Neptune (traditionally Jupiter). The ruling planet colours how its sign expresses itself in a birth chart.

Your chart ruler is the planet that rules your rising sign (Ascendant). Find your rising sign — which requires your exact birth time — then take its ruling planet: that planet’s sign, house and aspects describe how your whole chart is steered. A Scorpio rising, for example, has Pluto (traditionally Mars) as chart ruler.

Polarity divides the twelve signs into two groups of six: yang (masculine, active) fire and air signs, and yin (feminine, receptive) earth and water signs. The labels describe the direction of energy — outward or inward — not gender.

The six opposite pairs are Aries–Libra, Taurus–Scorpio, Gemini–Sagittarius, Cancer–Capricorn, Leo–Aquarius and Virgo–Pisces. Opposite signs sit 180° apart, share the same polarity, and describe two ends of one theme — self and other, holding on and letting go, detail and faith.

Because the traditional rulerships were fixed long before Uranus, Neptune and Pluto were discovered. Modern astrology assigned the new planets to Aquarius, Pisces and Scorpio while keeping Saturn, Jupiter and Mars as their traditional rulers — most astrologers today read both rulers side by side.

Each sign is a unique pairing of one of four elements (fire, earth, air, water) with one of three modalities (cardinal, fixed, mutable) — 4 × 3 gives exactly twelve combinations. Aries, for instance, is cardinal fire and Taurus fixed earth. That grid, plus the ruling planet, is the structural DNA of every sign.