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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 indefinitely large this plane may be treated as nearly equivalent to the parallel plane with its centre at the earth's center. This greatly simplifies understanding the geometry of the horoscope. Some writers on astrology have considered the effects of parallax, but most would agree that they are relatively minor; they are clearly beyond the scope of this article.

The zodiac refers to a band on the celestial sphere containing the signs. It is centered on the plane of the ecliptic, and its width is sufficient to allow for the fact that the plane of the orbits of the moon and all other planets is not parallel to the plane of the ecliptic. It has a width of approximately 18?.

The plane of the ecliptic is defined by the orbit of the earth and the sun. For all practical purposes the plane of the equator and the plane of the ecliptic maintain a constant inclination relative to each other of approximately 23.5°.