Natural House System: This system is based on equal divisions of the zodiac. Starts with the Ascendant at 0 degrees Aries, 2nd house 0 degrees Taurus and so on.
Equal Houses System: this system is based on equal divisions of the zodiac. Starts with the Ascendant at 0 degrees Aries, 2nd house 0 degrees Taurus and so on.
Placidus House System: The most popular house system. Calculated from night and day to space the zodiac then crosses the ecliptic path 1 degree every four minutes.
Koch House System: Is calculated from the polar elevation of the birthplace. Then take MC degree moving from horizon to the apex, divide into 3 to get the Asc.
Houses: A Contemporary Guide (Special Topics in Astrology Series) by Gwyneth Bryan
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