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Mr. Vaughan Unit 9

Earth-Moon-Sun System

TermDefinition
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.
Created by: dougteach65
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