Planets
Mars
Personal planet · rules Aries and Scorpio · drive and desire
Mars is the first planet beyond Earth's orbit and the most forceful of the personal bodies — the red planet, long the image of heat and conflict. It signifies drive and desire in their active form: assertion, courage, appetite and aggression, the will to pursue what one wants and to fight for it. Where Venus draws, Mars pursues.
The planet of drive and desire
Mars is the principle of energy directed outward — the capacity to want, to act and to contend. It governs assertion and ambition, courage and anger, physical vigour and sexual desire, and every situation in which force must be brought to bear: competition, confrontation, the overcoming of resistance. If the Sun is the will's purpose, Mars is its cutting edge.
In a chart Mars describes how a person pursues, defends and fights — quickly or slowly, openly or in reserve, cleanly or with friction. It is the measure of drive and of temper alike, for the same heat that accomplishes can also destroy; the sign and condition of Mars tell which way it tends.
Ruler of Aries and Scorpio, exalted in Capricorn
Mars rules two signs of very different force. In Aries it is drive at its most direct — the clean, immediate assertion of the cardinal fire sign; in Scorpio, its traditional domain before Pluto was assigned as modern ruler, it is desire at its deepest and most sustained, force held under pressure. It is exalted in Capricorn, where raw energy is disciplined into strategy and endurance and achieves the most.
By the dignities Mars is therefore in detriment in Libra and Taurus, the peace-loving signs ruled by its opposite Venus, where aggression sits uneasily with the wish for harmony and ease; and in fall in Cancer, where the instinct to protect and the tides of feeling blunt its edge. Mars works best where it can act with resolve, and least where it must yield or wait.
By sign, house, aspect and cycle
Mars takes about two years to circle the zodiac, spending roughly six or seven weeks in each sign. Its sign describes the style of action and desire; the house it occupies shows the field of life a person strives and fights in; its aspects reveal whether the drive serves the will and the heart or works at cross-purposes to them.
Every other year or so Mars turns retrograde for some two to two-and-a-half months, a period traditionally read as energy turned inward — frustrated, redirected or gathering rather than freely spent. Whether Mars was direct or retrograde at birth marks the way drive is expressed. The Mars sign is the outline of the will's edge; the house, aspects and cycle sharpen it, and a full chart is needed to see them.
Body, metal and correspondences
Medical astrology gives Mars the adrenal glands — the seat of the body's fight-or-flight response — together with the red blood cells and iron metabolism, and it rules acute, feverish and inflammatory conditions, the body at full heat. Its metal is iron, the metal of the blade and of the blood, and among the many nutrients linked to it are iron itself, vitamin B-12, folic acid and phosphorus. Its stones are red and hard: ruby, garnet, hematite, jasper, diamond and carnelian.
In Ernst Wilhelm's Vedic Bach-flower system — a tradition separate from the sign-based Bach mapping rather than a correction of it — Mars's remedy is Impatiens, whose theme is impatience and the irritation of a will that wants everything done at once. Astrolabe surfaces these correspondences for a chart's Mars, offered for reflection and as historical medical-astrology, not as medical advice.
The war-god among the personal planets
Mars takes its name from the Roman god of war, and older astrology counted it among the two malefics — the planets whose action tends to wound or destroy — alongside Saturn. The label is crude by modern standards, and a careful reading treats Mars's force as morally neutral: the same drive builds, defends and competes as readily as it harms. What matters is its condition and how the rest of the chart channels it.
As a nocturnal planet Mars works more easily by night, its heat better tempered under the cooler light. It completes the trio of personal planets — mind, love and drive — and pairs with Venus as the two faces of desire: the wanting that reaches out, and the wanting that goes and takes.
Common questions about Mars
What does Mars mean in a birth chart?
Mars describes how you assert yourself, pursue what you want, and handle anger and conflict. Its sign shapes your style of action and desire; its house shows where you direct your drive; its aspects show how that energy works with the rest of your nature. A full chart brings the three together.
What does Mars rule in astrology?
Mars rules Aries and, traditionally, Scorpio — of which Pluto is the modern ruler. It is exalted in Capricorn. Mars signifies drive, desire, courage, assertion and conflict, and in traditional medical astrology governs the adrenal glands, the blood's iron and inflammatory heat. Its metal is iron.
How often does Mars go retrograde?
Mars turns retrograde about once every two years, for roughly two to two-and-a-half months — the least frequent retrograde of the personal planets. It is read as a time when drive is checked, redirected or turned inward. Whether it was retrograde at your birth is shown by a full calculation.
Your drive, your energy, and how you go after what you want.
Mars is the first planet past Earth's orbit and the most forceful of the personal planets — the red planet, long the picture of heat and conflict. It stands for drive and desire in action: pushing forward, courage, appetite, and anger. Where Venus draws things near, Mars goes after them.
The planet of drive and desire
Mars is the planet of energy aimed outward — the power to want something, act on it, and fight for it. It rules ambition and courage, anger and physical vigor, competition and standing your ground. If the Sun is your willpower's purpose, Mars is its sharp edge.
In your chart Mars shows how you chase, defend, and fight — fast or slow, out in the open or held back, cleanly or with friction. It measures both your drive and your temper, because the same heat that gets things done can also burn. The sign and shape of your Mars tell you which way it tends to go.
What Mars rules
Mars rules two signs of very different force (it is the planet in charge of both). In Aries it is drive at its most direct and immediate. In Scorpio — its old sign, before Pluto was named the modern ruler — it is desire at its deepest, force held under pressure. It is exalted in Capricorn — a sign where a planet is honored and works especially well — where raw energy becomes patient strategy.
The harder spots are the opposite ones: Libra and Taurus (its detriment, the peace-loving signs ruled by its opposite Venus), where pushiness clashes with the wish for calm, and Cancer (its fall), where the urge to protect softens its edge. Mars works best where it can act with resolve, and worst where it has to wait or give way.
By sign, house, aspect, and cycle
Mars takes about two years to travel the whole zodiac, spending six or seven weeks in each sign. Its sign describes your style of action and desire. The house it is in (one of twelve life areas) shows where you push and fight. Its aspects (the angles it makes to other planets) show whether your drive helps your will and heart or works against them.
Every other year or so Mars turns retrograde (it looks like it is moving backwards from Earth) for about two to two and a half months — read as energy turned inward, held back or gathering rather than freely spent. Whether Mars was moving forward or backward at your birth shapes how you express drive. The sign is only the outline; the house, aspects, and cycle sharpen it, and a full chart shows them.
The war-god among the personal planets
Mars is named for the Roman god of war, and older astrology counted it as one of the two malefics — the planets whose action tends to wound — alongside Saturn. That label is rough: a careful reading treats Mars's force as neutral, because the same drive builds, defends, and competes just as easily as it harms. What matters is its condition and how the rest of your chart steers it.
As a night-time planet, Mars works more smoothly for someone born at night, its heat cooled by the darker light. It rounds out the three personal planets — mind, love, and drive (Mercury, Venus, Mars) — and pairs with Venus as the two faces of desire: the wanting that reaches out, and the wanting that goes and takes.
Common questions about Mars
What does Mars mean in a birth chart?
Mars shows how you assert yourself, go after what you want, and handle anger and conflict. Its sign shapes your style of action, its house shows where you aim your drive, and its aspects show how that energy works with the rest of you. A full chart brings the three together.
What does Mars rule?
Mars rules Aries and, traditionally, Scorpio (whose modern ruler is Pluto), and works especially well in Capricorn. It stands for drive, desire, courage, and conflict. In old medical astrology it governs the adrenal glands and the blood's iron, and its metal is iron.
How often does Mars go retrograde?
About once every two years, for roughly two to two and a half months — the least often of the personal planets. It is read as a time when drive is checked, redirected, or turned inward. A full chart shows whether it was retrograde when you were born.