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Unit 4

TermDefinition
rotation the spin of a body on its axis.
day the time it takes Earth to rotate once on its axis.
revolution the motion of a body that travels around another body in space; one complete orbit.
year the time it takes Earth to complete one revolution around the Sun.
season a division of the year with recurring weather conditions, caused by Earth’s tilt and its position in orbit.
equinox the time when day and night are about equal in length.
solstice the point when the Sun is farthest north or south of the equator.
satellite a natural or artificial body that revolves around a planet.
gravity a force of attraction between objects due to their masses.
lunar phases the different appearances of the Moon as seen from Earth throughout the month.
eclipse an event in which the shadow of one celestial body falls on another.
umbra the darkest part of a shadow where light is completely blocked.
penumbra the outer part of a shadow where light is only partially blocked.
tide the periodic rise and fall of ocean water levels.
tidal range the difference between high tide and low tide.
spring tide a tide with the greatest range, occurring during new and full moons.
neap tide a tide with the smallest range, occurring during the first and third quarter moons.
Created by: Kesly Sterling
 

 



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