Astronomers also needed another system of measurement, for although we have the Signs of the Zodiac, they are moving as part of the sphere of stars and are therefore not a fixed system of measurement. For this purpose astrologers have devised the 'House' system. These Houses form an imaginary but fixed grid centred on the earth and orientated according to the spot of ground on which you are standing. The twelve fixed House divisions are projected out into the sky forming the ribs of the system:
position of the observer the edge of the eastern horizon the edge of the western horizon point directly above observer the earth
Numbers indicate Houses
The First House is always located just under the eastern horizon (left-hand side of chart) with the rest numbered in order around the earth till House 12 is just above the eastern horizon. This is fixed, for the Houses are a man-made fixed grid, whilst the Zodiac is based on the natural phenomena of the moving Zodiacal Signs. These then provide two systems of reference for plotting the position of the planets; as a planet's position in the sky may be indicated by both its House and its Zodiacal Sign location.
Each of the Houses is given a meaning, so that each sector of the sky both above the earth and under the earth is associated with a particular type of question or function:
Figure 17 Houses of Heaven
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