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New millennium astrological chart
Most horoscopic traditions of astrology systems divide the horoscope into a number (usually twelve) of houses whose positions depend on time and location rather than on date. In Hindu astrological tradition these are known as Bhāvas. The houses of the horoscope represent different spheres of life, described in terms of physical surroundings as well as personal life experiences. In delineation the placement of a planet or zodiac sign in a house will determine to a large degree the area of life in which it acts, and the goals and activities on which its drive or impulse will be focused.
The houses are divisions of the ecliptic plane (a great circle containing the Sun's orbit as seen from the earth), at the time and place of the horoscope in question. They are numbered counter-clockwise from the cusp of the first house. Commonly, houses one through six are below the horizon and houses seven through twelve are above the horizon, but some systems may not respect entirely that division (in particular when the Ascendant does not coincide with the first house's cusp).
Every house system is dependent on the rotational movement of Earth on its axis, but there is a wide range of approaches to calculating house divisions and different opinions among astrologers over which house system is most accurate. To calculate the houses, it is necessary to know the exact time, date, and location. In natal astrology, some astrologers will use a birth time set for noon or sunrise if the actual time of birth is unknown. An accurate interpretation of such a chart, however, cannot be expected.
The several methods of calculating house divisions stem from disagreement over what they mean mathematically and temporally. All house systems in Western astrology use twelve houses projected on the ecliptic. The differences arise from which great circle is object of the initial division and whether the divisions represent units of time, or degrees of distance.
If time is the basis for house division, a difference must be made for whether the houses are based on invariant equal hours (each house represents 2 hours of the sun's apparent movement each day) or temporal hours (daytime and night-time divided into six equal parts, but here the temporal hours will vary according to season and latitude.)
If space is the basis for house division, the chosen plane is divided into equal arcs of 30° each. Here, too, a difference will be made as to whether these divisions are made directly on the ecliptic, or on the celestial equator or some other great circle, before being projected on the ecliptic.
Regardless of these different methods, all house divisions in Western astrology share certain things in common: the twelve house cusps are always projected on the ecliptic; they will all place the cusp of the first house near the eastern horizon and every house cusp is 180° of longitude apart from the sixth following house (1st opposes 7th; 2nd opposes 8th;...).
The twelve houses 
The Babylonians may have been the first to set out the twelve houses used today by the majority of astrologers. The houses were numbered from the east downward under the horizon, and represented areas of life on the following pattern with their areas of influence.
These are their traditional Latin names of the twelve houses, with their translations and other associated influences. This represents the basic outline of the houses as they are still understood today.
|House||Sign||Latin motto||Translation||Modern title of house||Interpretation|
|1st||Aries||Vita||Life||House of Self||Physical appearance, traits and characteristics. First impressions. General outlook into the world. Ego. Beginnings and initiatives.|
|2nd||Taurus||Lucrum||Wealth||House of Value||Material and immaterial things of certain value. Money. Belongings, property, acquisitions. Cultivation and growth. Substance. Self-Worth.|
|3rd||Gemini||Fratres||Brothers||House of Communications||Higher education and childhood environment. Communication. Happiness. Intelligence. Achievements. Siblings. Neighborhood matters. Short, local travel and transportations.|
|4th||Cancer||Genitor||Parent||House of Home and Family||Ancestry, heritage, roots. Early foundation and environment. Mother or mothers as figure. The caretaker of the household. Cyclic end of matters.|
|5th||Leo||Nati||Children||House of Pleasure||Recreational and leisure activities. Things which makes for enjoyment and entertainment. Games and gambling. Children. Love and sex. Creative self-expression.|
|6th||Virgo||Valetudo||Health||House of Health||Routine tasks and duties. Skills or training acquired. Jobs and Employments. Health and overall well-being. Service performed for others. Caretaking. Pets and small domestic animals.|
|7th||Libra||Uxor||Spouse||House of Partnerships||Close, confidante-like relationships. Marriage and business partners. Agreements and treaties. Matters dealing with diplomatic relations of all kinds, including open (known) enemies. Attraction to qualities we admire from the other partner.|
|8th||Scorpio||Mors||Death||House of Reincarnation||Cycles of Deaths And Rebirth. Sexual relationships and deeply committed relationships of all kinds. Joint funds, finances. Other person's resource. Occult, psychic and taboo matters. Regeneration. Self-transformation.|
|9th||Sagittarius||Iter||Journeys||House of Philosophy||Foreign travel and foreign countries. Culture. Long distance travels and journeys. Religion. Law and ethics. Higher education. Knowledge. Experience through expansion.|
|10th||Capricorn||Regnum||Kingdom||House of Social Status||Ambitions. Motivations. Career. Status in society. Government. Authority. Father or father figure. The breadwinner of the household. One's public appearance/impression at large(audience).|
|11th||Aquarius||Benefacta||Friendship||House of Friendships||Friends and acquaintances of like-minded attitudes. Groups, clubs and societies. Higher associations. Benefits and fortunes from career. One's hopes and wishes.|
|12th||Pisces||Carcer||Prison||House of Self-Undoing||Mysticism. Places of seclusion such as hospitals, prisons and institutions, including self-imposed imprisonments. Things which are not apparent to self, yet clearly seen by others. Elusive, clandestine, secretive or unbeknownst matters. Privacy, retreat, reflection, and self-sacrifice. Unconscious/subconscious. Unknown enemies.|
Many modern astrologers assume that the houses relate to their corresponding signs, i.e. that the first house has a natural affinity with the first sign, Aries, and so on.
Quadrants, modality, and triplicities 
In quadrant systems houses are classified as Angular, Succedent and Cadent. The houses themselves are respectively ruled by signs according to the astrological modality: Cardinal, Fixed, and Mutable.
|1st House (Aries; also known as the Ascendant or Rising Sign).||2nd House (Taurus)||3rd House (Gemini)|
|4th House (Cancer; also known as Imum Coeli).||5th House (Leo)||6th House (Virgo)|
|7th House (Libra; also known as the Descendent).||8th House (Scorpio)||9th House (Sagittarius)|
|10th House (Capricorn; also known as Medium Coeli).||11th House (Aquarius)||12th House (Pisces)|
Angular houses are points of initiation and represent action. The signs ruling angular houses are all Cardinal signs: Aries, Cancer, Libra and Capricorn. However, the discovery of a document called the Thema Mundi, or chart of the world, by Project Hindsight, suggests something different. In the chart of the world, the sign Cancer is on the ascendant, Leo is on the 2nd house, and so on. The Thema Mundi is the chart that is considered the key to the Helenistic system of astrology, from which much of modern astrology is derived, though at times inaccurately.
Succedent houses are points of purpose and represent stabilization. The signs ruling Succedent houses are all Fixed: Taurus, Leo, Scorpio and Aquarius. And finally, Cadent houses are points of transition and they represent change and adaptation. Cadent houses are ruled by Mutable Signs: Gemini, Virgo, Sagittarius and Pisces.
Furthermore, the houses are also grouped together by Triplicity: When one of the four elements (fire, earth, air, and water) in which the zodiac sign that rules the house is placed. There are three zodiac signs that fall within one of these four elements, hence their respective moniker, "The Triplicities".
|The Fire Triplicity||The Earth Triplicity||The Air Triplicity||The Water Triplicity|
|1st House (Aries)||2nd House (Taurus)||3rd House (Gemini)||4th House (Cancer)|
|5th House (Leo)||6th House (Virgo)||7th House (Libra)||8th House (Scorpio)|
|9th House (Sagittarius)||10th House (Capricorn)||11th House (Aquarius)||12th House (Pisces)|
In old astrological writings (e.g. William Lilly), house could also be used as a synonym for domicile or rulership, as in the sentence "The Moon has its house in Cancer" meaning that Cancer is ruled by the Moon. It may be helpful to think of a ruling planet, in this case the Moon, as the "owner of the 4th House", and the sign, e.g.Cancer, as the CEO or landlord who runs the house. In an individual horoscope, whatever sign occupies any given house can be thought of as the house's tenant. [See section heading Rulership below.]
In Indian astrology, the twelve houses are called Bhava and have meanings very similar to their Western counterparts.
Systems of house division 
There are many systems of house division. In most the ecliptic is divided into houses and the ascendant (eastern horizon) marks the cusp, or beginning, of the first house, and the descendant (western horizon) marks the cusp of the seventh house. Many systems of house division called quadrant house systems also use the midheaven (medium coeli) as the cusp of the tenth house and the nadir (imum coeli) as the cusp of the fourth house. Some house systems divide the celestial equator and the prime vertical instead of the ecliptic.
The earliest systems (whole sign and equal house) linked the houses to the signs of the zodiac. The equal house system defines houses as 30-degree sectors of the ecliptic, so that the cusp of each house falls on the same degree of each zodiac sign. One outcome of this is that a varying angle occurs between the ascendant and midheaven in higher latitudes. Attempts to reconcile the concept of "quadrants" with the varying angle between midheaven and ascendant lead to more complicated house systems. These became more relevant as astrology spread from subtropical regions to higher latitudes.
Goals for a house system include ease of computation; agreement with the "quadrant" concept (ascendant on the first house cusp, nadir on the fourth, descendant on the seventh, and midheaven on the tenth); defined and meaningful behaviour in the polar regions; acceptable handling of heavenly bodies of high latitude (a distinct problem from high-latitude locations on the Earth's surface); and symbolic value. It is impossible for any system to satisfy all the criteria completely, so each one represents a different compromise. The extremely popular Placidus and Koch systems, in particular, can generate undefined results in the polar circles. Research and debate on the merits of different house systems is ongoing.
Early forms of house division 
The earliest forms of house division were those that link with, or run parallel to, the signs of the zodiac along the ecliptic. Proponents of the equal house system claim that it is more accurate and less distorting in higher latitudes (especially above 60 degrees) than the Placidean and other quadrant house systems.
Whole sign 
In the whole sign house system, sometimes referred to as the 'Sign-House system', the houses are 30° each. The ascendant designates the rising sign, and the first house begins at zero degrees of the zodiac sign in which the ascendant falls, regardless of how early or late in that sign the ascendant is. The next sign after the ascending sign then becomes the 2nd house, the sign after that the 3rd house, and so on. In other words, each house is wholly filled by one sign. This was the main system used in the Hellenistic tradition of astrology, and is also used in Indian astrology, as well as in some early traditions of Medieval astrology. It is thought to be the oldest system of house division.
The Whole Sign system may have been developed in the Hellenistic tradition of astrology sometime around the 1st or 2nd century BCE, and from there it may have passed to the Indian and early Medieval traditions of astrology; though the line of thought which states that it was transmitted to India from Western locales is hotly contested. At some point in the Medieval period, probably around the 10th century, whole sign houses fell into disuse in the western tradition, and by the 20th century the system was completely unknown in the western astrological community, although was continually used in India all the way into the present time. Beginning in the 1980s and 1990s the system was rediscovered and reintroduced into western astrology. The distinction between equal houses and whole sign houses lies in the fact that in whole sign houses the cusp of the 1st house is the beginning of the sign that contains the ascendant, while in equal houses the degree of the ascendant is itself the cusp of the 1st house.
Equal house 
In the equal house system the ecliptic is also divided into twelve divisions of 30 degrees, although the houses are measured out in 30 degree increments starting from the degree of the ascendant. It begins with the ascendant, which acts as the 'cusp' or starting point of the 1st house, then the second house begins exactly 30 degrees later in zodiacal order, then the third house begins exactly 30 degrees later in zodiacal order from the 2nd house, and so on.
The MC in whole sign & equal house systems 
In the whole sign and equal house systems the Medium Coeli (Midheaven), the highest point in the chart, does not act as the cusp or starting point of the 10th house. Instead the MC moves around the top half of the chart, and can land anywhere in the 7th, 8th, 9th, 10th, 11th, 12th, depending on the latitude. The MC retains its commonly agreed significations, but it doesn't act as the starting point of the 10th house, therefore in Equal house it adds extra definition and meaning to MC and the cusps involved, but always MC is same in interpretations as other house systems.
This is also the more common criticism of the whole sign and equal house method as it concerns the location of the Medium Coeli (Midheaven), the highest point in the chart. In the equal house system, the ascendant/descendant and midheaven/nadir axes can vary from being perpendicular to each other (from approx. +-5 deg at most at equator to approx. +-15 degrees at Alexandria to +-90 degrees at polar circle). As a result, equal houses counted from the ascendant cannot in general place the midheaven on the tenth house cusp, where many feel it would be symbolically desirable. Since this point is associated with ambition, career, and public image, the argument is that the Midheaven, therefore, must be the cusp of the similar tenth house. It has also been linked by extension with Capricorn (the tenth sign of the zodiac). Equal house system always takes MC to be first and foremost THE most important indicator of career, but 10th house cusp is simple like a weaker 2nd MC cusp and would be taken into account, but not at the expense of MC. Because the Whole Sign and Equal House system do take the Midheaven into account, but relies on the location of the Ascendant, it can be found anywhere between the 8th and 11th houses.
Quadrant house systems 
Quadrant house systems divide the houses so that they agree with the "quadrant" concept (ascendant on the first house cusp, nadir / Imum Coeli on the fourth, descendant on the seventh, and midheaven / Medium Coeli on the tenth).
Each quadrant of the ecliptic is divided into three equal parts between the four angles. This is the oldest system of quadrant style house division. Although it is attributed to Porphyry of Tyros, this system was first described by the 2nd-century astrologer Vettius Valens, in the 3rd book of his astrological compendium known as The Anthology.
The predecessor system to the Placidus, which largely replaced the Porphyry. The difference with Placidus is that the time that it takes the ascendant to reach the meridian is divided equally into three parts. The Alchabitius house system was very popular in Europe before the introduction of the Regiomontanus system. Alchabitius (or Alcabitius ), was a 10th-century Arabian astrologer (died 967).
The celestial equator is divided into twelve, and these divisions are projected on to the ecliptic along great circles that take in the north and south points on the horizon. Named after the German astronomer and astrologer Johann Müller of Königsberg. The Regiomontanus system was later largely replaced by the Placidus system.
Also known as the Axial system, it divides the celestial equator in twelve 30º sectors (starting at the local meridian) and projects them on to the ecliptic along the equally spaced meridians (great circles containing the North and South poles). The intersections of the ecliptic with those set meridians provide the house cusps. The 10th house cusp thus equals the Midheaven, but the East Point (also known as Equatorial Ascendant) is now the first house's cusp. The Ascendant (intersection between the ecliptic and the horizon) preserves its importance in chart interpretation through sign and aspects, but not as a house determinant, which is why this house system can be used in any latitude.
This is the most commonly used house system in modern Western astrology. The paths drawn for each degree of the ecliptic to move from the nadir to the horizon, and from the horizon to the midheaven, are trisected to determine the cusps of houses 2, 3, 11, and 12. The cusps of houses 8, 9, 5 and 6 are opposite these. The Placidus system is sometimes not defined beyond polar circles (latitudes greater than 66°N or 66°S), because certain degrees are circumpolar (never touch the horizon), and planets falling in them cannot be assigned to houses without extending the system. This is the result of his weaknesses of the Placidean system according to its critics, which often cite the exceptional house proportions in the higher latitudes.
Named for 17th-century astrologer Placidus de Titis, it is thought the Placidus system was first mentioned about 13th century in Arab literature, but the first confirmed publication was in 1602 by Giovanni Antonii Magini (1555–1617) in his book "Tabulae Primi Mobilis, quas Directionem Vulgo Dicunt". The first documented usage is from Czech, 1627. Later it was popularized by Catholic Church as an argument for Ptolemy's geocentric theory of the Solar System, in the campaign against the heliocentric theory. Placidus, a professor of mathematics, was named as its author to give it credibility to his contemporaries. Placidus remains the most popular system among English-speaking astrologers
The prime vertical (the great circle taking in the zenith and east point on the horizon) is divided into twelve, and these divisions are projected on to the ecliptic along great circles that take in the north and south points on the horizon. It is attributed to Campanus of Novara but the method is known to have been used before his time.
A rather more complicated version of the Placidus system, built on equal increments of Right Ascension for each quadrant. The Koch system was developed by the German astrologer Walter Koch (1895–1970) and is defined only for latitudes between 66°N and 66°S. This system is popular among research astrologers in the U.S. and among German speakers, but in Central Europe lost some popularity to the Krusiński house system.
This is a recent system, invented in Argentina, that its creators claim has been determined empirically, i.e. by observing events in people's lives and assessing the geometry of a house system that would fit. The house cusps are always within a degree of those given in the Placidus system. The geometry is somewhat complicated and the reader is referred to this site for an explanation and this one too. The topocentric system can also be described as an approximation algorithm for the Placidus system.
Topocentric houses are also called Polich-Page, after the names of the house system creators, Wendel Polich and A. Page Nelson.
The Neo-Porphyry system of house division is similar to Porphyry houses except that instead of each quadrant being divided into three equal sized houses, the middle house in each quadrant is compressed or expanded based on the whether the quadrant covers less than or greater than 90 degrees. In other words, houses are smooth around the zodiac with the difference in quadrant sizes being spread in a continuous sinusoidal manner from expanded to compressed houses. Neo-Porphyry houses were invented and first published by Walter Pullen in his astrology program Astrolog in 1994.
A recently published (1995) house system, based on a great circle passing through the ascendant and zenith. This circle is divided into 12 equal parts (1st cusp is ascendent, 10th cusp is zenith), then the resulting points are projected to the ecliptic through meridian circles.
The house tables for this system were published in 1995 in Poland. This house system is also known under the name Amphora in the Czech Republic, after it was proposed there by Milan Píša after the study of Manilius's "Astronomica" under this name ("Konstelace č. 22" in: "AMPHORA - nový systém astrologických domů" (1997) and in the booklet "Amphora - algoritmy nového systému domů" (1998)).
In Hellenistic, Vedic, Medieval and Renaissance astrology each house is ruled by the planet that rules the sign on its cusp. For example, if a person has the sign Aries on the cusp of their 7th house, then the planet Mars is said to "rule" their 7th house. This means that when a planet is allotted a house, its nature comes to have some bearing on that specific topic in the person's life, and that planet is said to be very important for events specifically pertaining to that topic. The placement of this planet in the chart will have at least as much influence on the chart as the planets within the house. In traditional Western & Hindu astrology, each sign is ruled by one of the 7 visible planets (note that in astrology, the Sun and Moon are considered planets, which literally means wanderers, i.e. wandering stars, as opposed to the fixed stars of the constellations).
In addition, some modern astrologers who follow the X=Y=Z or Planet=Sign=House doctrine, which was first taught by Alan Leo in the early part of the 20th century, believe that certain houses are also "ruled" by, or have an affinity with, the planet which rules the corresponding zodiacal sign. For instance, Mars is ruler of the 1st house because Aries is the first sign, Mercury rules or has an affinity with the 3rd house because Gemini is the 3rd sign, etc.
This highly oversimplified concept is sometimes referred to as "natural rulership", as opposed to the former which is sometimes called "accidental rulership." It is problematic when we consider that Neptune is not a planet that rules any sign under the ancient rules, because it was not known to the ancients.
The theory of "natural rulership" of a house is also challenged by a document from the Hellenistic era called the Thema Mundi, a teaching chart the name of which translates to the chart of the world. This chart has Cancer in the ascendant, which suggests that the astrologers from whom we inherit most of our astrological knowledge were proposing that the 1st house is associated with the sign Cancer. Astrologer Eric Francis has described this as the "90-degree shift issue."
Rationale behind twelve houses 
Babylonians started observing natural phenomena connected with ascending and culminating of the heavenly bodies. This evolved into 12 division system of houses before the discovery of the ecliptic. Later (around V c. bce) ecliptic was discovered (Schmidt&Hand "On the invariance of tropical Zodiac" and "Early house divisions in the Hellenistic era"). At the beginning this early zodiac it has no sign divisions, and only 18 bright stars were used as markers to measure planet positions. Later in Alexandria astrologers introduced the twelve signs to fit the number and probably meanings of the houses, and named constellations after them. Nowadays, practising astrologers use a 12 house division. Most theoreticians attribute 8 fold division for misinterpretation of old texts only, but one theoretician Patrice Guinard  has argued, contrary to that prevailing opinion, that there is a basis for an 8 house division. One prominent astrologer, Marc Penfield, uses 8 houses - dividing each quadrant using the same technique as in Koch & Placidus. Michel Gauquelin divided Placidus houses into 36 (instead of 12) "decans" and marked beginning of the 36th "decan" (the first before ascendant) as the starting point.
- Nicholas DeVore, Encyclopedia of Astrology (1948, Philosophical Library), sub. tit. "Houses"
- Derek and Julia Parker, "The New Compleat Astrologer", p12, Crescent Books, New York, 1990
- Derek and Julia Parker, Ibid, p175, 1990
- James Holden, Ancient House Division, Journal of Research of the American Federation of Astrologers 1 (1982), pgs. 19-28. Also see Rob Hand, Whole Sign Houses: The Oldest House System, ARHAT Publications, 2000.
- Jeff Mayo, Teach Yourself Astrology , p76, Hodder and Stoughton, London, 1979
- Astrodatabank FAQ n.5
- North, John David (1986). "The eastern origins of the Campanus (Prime Vertical) method. Evidence from al-Bīrūnī". Horoscopes and history. The Warburg Institute, University of London. pp. 175–176. ISBN 978-0-85481-068-0.