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| the magnitude or brightness of a star as it appears to an observer on the earth |
| the small circle of the celestial sphere whose plane is tangent to the earth at the position of the observer |
| outer planet | |
| —n | |
| any of the planets Jupiter, Saturn, Uranus, Neptune, and (formerly) Pluto, whose orbit lies outside the asteroid belt | |
| outer planet
Any of the five planets Jupiter, Saturn, Uranus, Neptune, and Pluto, whose orbits lie outside that of Mars. With the exception of Pluto, the outer planets are large gas giants. Compare inner planet. See also superior planet. |