Houses & House Systems

The First House represents your outer personality, physical appearance, and how you present yourself to the world. It is the mask you wear, the first impression you make, and your instinctive approach to new situations. The cusp of the First House is the Ascendant (Rising Sign) — one of the most important points in the chart.

The Second House governs your relationship with money, material possessions, and personal values. It reflects what you value most, how you earn and spend resources, and your underlying sense of self-worth and security.

The Third House governs communication, learning, and the immediate environment. It rules siblings, neighbors, short-distance travel, early education, and the way you process and share information.

The Fourth House represents home, family, and your deepest foundations. It rules your ancestry, the parent who provided emotional security, your private inner world, and the conditions at the end of life. The cusp of the Fourth House is the Imum Coeli (IC), the lowest point of the chart.

The Fifth House is the house of creative self-expression, pleasure, and joy. It rules romance (as distinct from committed partnership), children, hobbies, entertainment, gambling, and anything you do purely for the joy of doing it.

The Sixth House governs daily routines, health, work, and service. It rules your habits, diet, exercise, workplace relationships (as opposed to career ambition, which is the Tenth House), and your relationship with employees or those who serve you.

The Seventh House represents committed partnerships, marriage, and significant one-to-one relationships. It also rules business partnerships, contracts, open adversaries, and how you relate to others as equals. The cusp of the Seventh House is the Descendant — directly opposite the Ascendant.

The Eighth House governs transformation, shared resources, and the deeper dimensions of intimacy. It rules inheritances, taxes, debts, other people's money, sexual union, death and rebirth, and psychological transformation. This is the house of experiences that change you fundamentally.

The Ninth House represents the expansion of consciousness through higher education, long-distance travel, philosophy, religion, law, and the search for meaning. It governs your worldview, belief system, and encounters with cultures and ideas beyond your immediate experience.

The Tenth House represents career, public reputation, achievement, and your contribution to society. It governs your ambitions, social status, authority, and the parent who represented worldly achievement. The cusp of the Tenth House is the Midheaven (MC) — the highest point of the chart and one of the most visible angles.

The Eleventh House governs friendships, groups, communities, and your hopes for the future. It rules organizations, social movements, humanitarian causes, and the broader network of people who share your ideals and aspirations.

The Twelfth House represents the unconscious mind, hidden matters, solitude, and spiritual transcendence. It governs dreams, secrets, self-undoing, confinement (hospitals, prisons, retreats), and the dissolution of the ego. Planets here often operate in ways that are not immediately visible, even to the individual.

Whole Sign

~1st–2nd century BCE (Hellenistic)

The oldest house system, used in Hellenistic astrology and still the primary system in Vedic (Hindu) astrology. Each house corresponds to one entire zodiac sign. The sign containing the Ascendant degree becomes the entire First House, the next sign becomes the Second House, and so on. Simple, elegant, and unambiguous — it produces no intercepted signs.

Equal House

Hellenistic era

Each house spans exactly 30 degrees, beginning from the exact degree of the Ascendant. For example, if the Ascendant is at 15° Aries, the First House runs from 15° Aries to 15° Taurus, the Second House from 15° Taurus to 15° Gemini, and so on. Unlike Whole Sign, the Midheaven (MC) can fall in any house, not necessarily the Tenth.

Placidus

First published 1602 (Giovanni Antonio Magini); popularized by Placidus de Titis in the 17th century

The most commonly used house system in modern Western astrology. Placidus is a time-based system that trisects the semi-arc — the path each degree of the ecliptic takes from the horizon to the meridian. This creates unequal house sizes that vary by latitude. The system fails at extreme latitudes (beyond ~66° N/S) where some degrees of the ecliptic never rise or set, producing distorted or undefined houses.

Koch

Developed by Walter Koch (1895–1970)

A variation of the Placidus approach that uses equal right ascension increments rather than trisecting the semi-arc. Koch houses are calculated by dividing the time it takes for the Ascendant degree to reach the Midheaven into three equal intervals. Like Placidus, it is latitude-dependent and fails at high latitudes.

Regiomontanus

Named for Johannes Müller von Königsberg (Regiomontanus), 15th century

Divides the celestial equator into twelve 30-degree segments, then projects these divisions onto the ecliptic using great circles through the north and south points of the horizon. It was the dominant system in Europe from the 15th into the 17th century and is still preferred by many horary astrologers.

Campanus

Attributed to Campanus of Novara, 13th century (but likely older)

Divides the prime vertical (the great circle passing through the zenith and the east/west points of the horizon) into twelve 30-degree segments, then projects these onto the ecliptic. Campanus houses emphasize the local space around the native and are favored by some modern astrologers for this reason.

Porphyry

First described by Vettius Valens (2nd century CE); attributed to Porphyry of Tyros (3rd century CE)

The oldest quadrant house system. It simply trisects the ecliptic arc between each pair of angles (Ascendant, MC, Descendant, IC) to create house cusps. The result is that houses within each quadrant are equal in size, though quadrants themselves may differ. Straightforward and easy to calculate.

Alchabitius (Alcabitius)

Islamic era, named for Al-Qabisi (10th century)

A predecessor to the Placidus system that was the most popular house system in Europe before Regiomontanus replaced it in the 15th century. It trisects the semi-arc of the Ascendant (rather than each degree of the ecliptic, as Placidus does).

Topocentric

Developed by Wendel Polich and A.P. Nelson Page, mid-20th century (Argentina)

A relatively modern system that produces house cusps very close to Placidus in practice but is derived from a different mathematical basis. It constructs cone-shaped divisions from the observer's actual position on the Earth's surface, making it technically a 'topocentric' (place-centered) system.