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Mr. Vaughan Unit 9
Earth-Moon-Sun System
Term | Definition |
---|---|
rotation | the spinning of a body, such as a planet, on its axis. |
day | the time it takes a planet to complete one full rotation on its axis. |
revolution | the motion of a body that travels around another body in space. |
year | a full revolution around the sun, 365 1/4 days. |
season | part of the year that is characterized by a pattern of similar temperatures and other weather related trends. |
equinox | sunlight shines equally on the northern and southern hemispheres. |
solstice | the area of sunlight is at a maximum in one hemisphere and at a minimum at the other hemisphere. |
satellite | a body that orbits a larger body. |
gravity | a force of attraction between objects that is due to their masses. |
lunar phases | the different appearances of the moon from earth throughout the month. |
eclipse | the event when the shadow of one celestial object falls on another. |
umbra | the darker part of a shadow that blocks sunlight. |
penumbra | the outer part of a shadow which sunlight is only partially blocked. |
tide | daily changes in the level of ocean water. |
tidal range | the difference in the level of ocean water between high and low tides. |
spring tide | tides that have the largest daily tidal range. The sun, moon, and earth form a straight line. |
neap tide | tides that have the smallest daily tidal range. The sun, moon, and earth form a 90' angle. |