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Physical Science

QuestionAnswer
eclipse an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination. "an eclipse of the sun"
lunar eclipse an eclipse in which the moon appears darkened as it passes into the earth's shadow.
solar eclipse an eclipse in which the sun is obscured by the moon.
umbra the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse. ASTRONOMY
full moon the phase of the moon in which its whole disk is illuminated.
new moon the phase of the moon when it is in conjunction with the sun and invisible from earth, or shortly thereafter when it appears as a slender crescent.
equniox the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20).
summer solstice the solstice that marks the onset of summer, at the time of the longest day, about June 21 in the northern hemisphere and December 22 in the southern hemisphere.
winter solstice the solstice that marks the onset of winter, at the time of the shortest day, about December 22 in the northern hemisphere and June 21 in the southern hemisphere.
axis an imaginary line about which a body rotates.
hemisphere a half of a sphere. a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.
Created by: andrew1234