3 - 03 Revolution and Insolation
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9 Terms
revolution
The movement of one object in a circular or elliptical path around another object. Planets revolve around a star. Natural satellites revolve around planet.
axis
An imaginary line through the center of an object, about which the object will rotate. Earth's axis runs between the North and South Poles.
hemisphere
The two halves of the Earth divided by the equator.
unequal heating
The process where parts of the Earth near the equator receive more direct light of the sun than the areas near the poles.
year
The length of time it takes Earth to make one complete revolution of the sun: 365.25 days.
seasons
Parts of the year with different amounts of daylight and weather conditions based on the amount of sunlight being received.
insolation
The amount of solar radiation reaching an area.
solstice
The longest and shortest days of the year, when the sun its highest or lowest point in the sky at noon (about June 21st and December 21st). The maximum and minimum insolation.
equinox
The bi-annual point at which the sun crosses the equator, when day and night are of equal length (about September 22nd and March 20th).