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| the partial or imperfect shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off |
| the magnitude or brightness of a star as it appears to an observer on the earth |
| last quarter | |
| —n | |
| Compare first quarter one of the four principal phases of the moon, occurring between full moon and new moon, when half the lighted surface is visible | |