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The Reason for the Seasons
The Reason for the Seasons
16
Science
8th Grade
09/27/2007

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Term
AUTUMNAL EQUINOX
Definition
When the sun is directly over the equator on September 23
Term
AXIS
Definition
An imaginary straight line around which an object, like a planet, turns;a line that goes through the North and South Poles
Term
EQUINOX
Definition
The days in which daytime and nighttime are of equal duration
Term
REVOLUTION
Definition
the movement of one object around another;the movement of the Earth around the Sun takes one year
Term
REVOLVE
Definition
To move in orbit around another object
Term
ROTATE
Definition
To turn around a central point or axis
Term
ROTATIONAL PERIOD
Definition
The time that it takes a planet, moon or other orbiting body to turn once around its axis - one "day".
Term
ORBIT[image]
Definition
A closed path that an object takes as it revolves around another body. They are generally elliptical.
Term
SEASONS
Definition
Spring, summer, fall (autumn), and winter; caused by the tilt of the Earth's axis.
Term
SOLSTICE
Definition
Days when the Sun reaches its farthest northern and southern declinations; marks the beginning of winter (this is the shortest day of the year) and marks the beginning of summer (this is the longest day of the year).
Term
SUMMER SOLSTICE
Definition
June 21 (this is the LONGEST day of the year).
Term
VERNAL EQUINOX
Definition
When the sun is directly over the equator on March 21
Term
WINTER SOLSTICE
Definition
occurs on December 21 and marks the beginning of winter (this is the shortest day of the year) in the Northern Hemisphere.
Term
TILT of earth's AXIS
Definition
23.5 degrees
Term
Distance from the earth to the sun
Definition
approximately 93 million miles
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