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Earth-Sun-Moon Sys

Earth Sun Moon System

TermDefinition
rotation how long the Earth takes to spin around on its axis. (24 hours) happens DAILY and is the reason for sunrise and sunset (east to west)
revolution how long the Earth takes to orbit the sun one time. (365 days) happens YEARLY and is the reason for seasons
Earth's spin axis fixed in direction but tilted in relation to its orbit around the sun//reason for seasons
Earth's tilt in winter Winter in the Northern Hemisphere: the North Pole is tipped away from sun ; sun strikes the Northern Hemisphere at a shallow angle for a short period of time
Earth's tilt in spring Spring in the Northern Hemisphere: the North Pole is tilted neither toward or away from the sun; Days and nights are equal in length in the spring
Earth's tilt in summer Summer in the Northern Hemisphere: the North Pole is tipped toward the sun ; sun strikes the Northern Hemisphere more directly and the sun stays in the sky for a longer time
Earth's tilt in fall Fall in the Northern Hemisphere: the North Pole isn't tipped toward or away from the sun ; days and nights are equal in length in the fall.
Moon phases moon's orbit causes changes in appearance on Earth, the moon doesn't always look like a perfect circle in the sky and appearance changes over time
waxes when moon appears to grow
wanes when moon appears to shrink
eclipse result of total or partial masking of a celestial body by another celestial body along an observer's line of sight
solar eclipse when the moon blocks our view of the sun during a new moon phase
lunar eclipse when the Earth is between the sun and the moon. moon looks dark reddish for about 1 hour; only happens during a new moon phase when the sun and the moon are on opposites sides of the Earth
what gravitational force depends on mass of objects and distance between those objects
lunar phase phases of the Moon are caused by the changing positions of the Moon, Earth, and the Sun
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