The document defines several astrological terms:
- The ecliptic is the path of the sun. The meridian and equator intersect at different points as the ecliptic is inclined at an angle to the equator.
- The ascendant, 10th house, and 7th house are where the ecliptic intersects the eastern horizon, meridian, and western horizon.
- The angle between the ecliptic and equator is zero at the Aries and Libra first points and maximum at Cancer and Capricorn.