All systems of astrology, east and west, base their predictions according to the aspects which exist between the planets in the chart. By the theory of aspects, planets project their influence to certain points from their given position in the zodiac. These are determined by the angle of arc of the zodiacal circle relative to the planet's position.
Imagine the zodiac as a circle and the locations of the planets as points along that circle. Draw a line from the points of the planets to the center of the circle. If we then compare the positions of any two planets a certain angle or arc of that circle will be created. This can be measured in terms of degrees. Some of these degrees, like 90, 120 or 180, create various aspects according to the different systems of astrology.
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