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  • The plane of the ecliptic is defined by the orbits of the Earth and the Sun. For practical purposes, the plane of the equator and the plane of the ecliptic maintain a constant inclination to each other of approximately 23.5°.
  • The plane of the horizon is centred on the native, and is tangential to the Earth at that point. In a sphere whose radius is infinitely large, this plane may be treated as nearly equivalent to the parallel plane, with its centre at the Earth's centre. This greatly simplifies the geometry of the horoscope, but does not take into account that the native is in motion. Some writers on astrology have thus considered the effects of parallax, but most would agree that (apart from that of the Moon) they are relatively minor.[citation needed]