What houses add
Houses divide a chart in relation to the local horizon and meridian, or to a convention anchored to the rising sign. They connect planetary symbolism with areas of life. Unlike a simple planetary longitude, a house placement depends on location and time.
Whole-sign houses
In whole-sign houses, the entire zodiac sign containing the Ascendant becomes the first house, and subsequent signs form successive houses. The Ascendant retains its exact degree within that first house. The Midheaven can fall outside the tenth whole-sign house.
Equal houses
A common equal-house method starts the first house at the exact Ascendant degree and divides the circle into twelve equal 30° houses. This preserves equal sizes while differing from whole-sign boundaries. The Midheaven is not forced to be the tenth cusp.
Quadrant systems
Quadrant approaches such as Placidus use the Ascendant and Midheaven as important dividing points, with intermediate cusps calculated according to the chosen method. Houses may have unequal sizes, and some systems encounter limitations at high latitudes.
Why results differ
A planet near a cusp may change house when the house system or birth time changes. This is not necessarily a software error. Record the method and compare the exact positions before interpreting the difference.
What an empty house means
An empty house has no included planet within it. It still exists, has a sign or signs associated with it, and can be studied through its ruler and relevant transits. It does not mean that relationships, work, family, or another area of life is absent.
This guide describes symbolic conventions and traditions. Astrological interpretations are not scientifically established predictions about personality or events. Our sources and editorial approach.