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earth, sun, and moon
vocab
| Term | Definition |
|---|---|
| rotation | the spinning of earth on its axis, causing day and night |
| revolution | the movement of earth around the sun, taking approximately one year |
| axis | the imaginary line around which a planet spins |
| orbit | the path one celestial body takes around another |
| eclipse | an event where one celestial body moves into the shadow of another celestial body |
| solstice | the two times in the year when the sun is at is greatest distance from the celestial equator, resulting in the longest and shortest days |
| equinox | the two times in the year when day and night, are of equal length, occurring when the sun crosses the celestial equator |
| lunar phases | the different appearances of the moon as seen from earth, resulting from the moons position relative to earth and the sun |
| tide | the periodic rise and fall of sea levels caused by the gravitational interactions between earth, the moon, and the sun |
| gravity | the force that attracts a body toward the center of the earth or toward any other physical body having mass |
| solar eclipse | an event where the moon passes between the earth and the sun, blocking all or part of the suns light |
| lunar eclipse | and event where the earth passes between the sun and the moon, causing earths shadow to fall on the moon |
| spring tide | a tide with the greatest difference between high and low water levels |
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