Description
The houses are divisions of the ecliptic plane (a great circle containing the Sun and Earth'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;...).
Read more about this topic: House (astrology)
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