1. ;Inclination : the angle between a reference plane and another axis. 2. Older relief maps often show heights above the old reference planes . 3. In the sense discussed here the reference plane is the Earth's equatorial plane. 4. This window, if maximized to full dimensions of the screen, is the reference plane . 5. The polar angle is often replaced by the "'elevation angle "'measured from the reference plane . 6. These choices determine a reference plane that contains the origin and is perpendicular to the zenith. 7. This is the 2-inch clearance between the car's reference plane and the bottom of the sidepod ." 8. By definition, the reference plane for the solar system is usually considered to be the earth's orbital plane. 9. For the orbit of the Moon around the Earth, the reference plane is taken to be the ecliptic, not the equatorial plane. 10. The reference plane can either be aligned with the Earth's equator, the plane of the ecliptic or the plane of the Milky Way galaxy.
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