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