Imaginary line through Earth that extends from the N. Pole to the S. Pole and is the center for Earth's rotation
Axis
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A phenomenon or process that involves multiple steps and repeats itself
Cyclic Patterns
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An obscuring from the light of a celestial body by the passage of an object bet/ the celestial body and the observer or bet/ the celestial body and its source of illumination
Eclipse
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The full moon passes into Earth's shadow causing the moon to appear reddish in color when the sun, Earth, and moon directly line up; lasts for 1 - 3 1/2 hours
lunar eclipse
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The shape of the illuminated portion of the moon as seen by an observer; usually on Earth
lunar phases
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A celestial body that revolves around a planet
moon
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A curved path followed by a satellite as it revolves around an object
Orbit
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The 4 natural divisions of the year based on changes in temperature due to the varied amounts of sunlight (both intensity and daylight hours received); caused by the tilt of the earth during revolution
seasons
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The moon passes between earth and sun covering all or part of the sun; occurs when the sun, earth, and moon directly line up; lasts for less than 12 minutes
solar eclipse
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The sun, and group of planets, and other celestial bodies that are held by the gravitational attraction and revolve around the sun
solar system
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A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy is generated by nuclear reactions in its interior
Star
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The luminous star around which Earth and other planets revolve; composed mainly of hydrogen and helium
Sun
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The slant of Earth's axis which is 23.5 degrees from vertical compared to Earth's orbital plane around the sun; as a result the North Pole always points to the North Star
Tilt
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The branch of science that studies the physical universe beyond Earth's atmosphere
Astronomy
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The outer atmosphere of the sun. A thin, extremely hot plasma over 1,000,000 deg. Celsius compared to around 6,000 deg. Celsius for the visible surface
