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Portable Network Graphic  |  1996-04-23  |  6KB  |  242x277  |  8-bit (43 colors)
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OCR: PLANE .............................................. A PLANE IS a flat surface. The orbital plane of a planet is the imaginary plane of unlimited extent in which the planet's orbital path lies. The Earth's equator is situated in a plane that intersects the center of the Earth at right angles to the Earth's axis of rotation. This plane is called the equatorial plane.