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Definition
| a plane curve such that the sums of the distances of each point in its periphery from two fixed points, the foci, are equal. It is a conic section formed by the intersection of a right circular cone by a plane that cuts the axis and the surface of the cone. |
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Definition
| the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth |
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Definition
| the point in an orbit when the planet is closest to the sun |
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Definition
| the in an orbit in which the planet is the furthest from the sun |
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Term
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Definition
| the motion of one body about another. as earth about the sun |
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