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Seasons
RevolutionRevolutionThe action of one object moving around another in an orbital path
This object This object just completed just completed
a revolutiona revolution
RevolutionRevolutionThe Earth’s revolution takes about one year, or 365 days
Example - RevolutionExample - Revolution
•The Earth revolves around the Sun
EarthEarth
SunSun
Earth’s TiltEarth’s Tilt•The Earth’s axis is tilted 23 ½ degrees
23 ½ Degree Tilt
Tilted Axis
Earth’s SeasonsEarth’s Seasons
Caused by the different
hemispheres of the Earth being tilted more or less towards the Sun. EquatorEquator
Axis
EarthEarth
SunSun
The hemisphere tilted towards the Sun
gets more direct light rays from the Sun.
Earth’s SeasonsEarth’s Seasons
More More direct rays direct rays
of lightof light
Less direct Less direct rays of rays of lightlight
SunSun
Earth’s SeasonsEarth’s Seasons•Less direct rays = winter
•More direct rays = summer
SunSun
Summer in this Summer in this hemispherehemisphere
Winter in this Winter in this hemispherehemisphere
•When both hemispheres get an equal amount of light, we have fall or spring
Earth’s SeasonsEarth’s Seasons
SunSun
Earth’s SeasonsEarth’s Seasons
The reason one hemisphere is tilted more towards the sun is due to the Earth’s revolution
around the Sun
Spring – Spring – Northern Hemisphere
Fall – Fall – Northern Hemisphere
Winter Winter Northern Hemisphere
Summer Summer Northern Hemisphere
Fall and SpringFall and Spring• North and South North and South
Hemispheres are Hemispheres are getting an equal getting an equal amount of Sun’s amount of Sun’s direct raysdirect rays
SunSun
Fall Fall
FallFall
SpringSpring
SpringSpring
WinterWinter• Northern Northern
Hemisphere is Hemisphere is getting less of the getting less of the Sun’s direct raysSun’s direct rays
SunSun
SummerSummer
WinterWinter
SummerSummer• Northern Hemisphere Northern Hemisphere
is getting more of the is getting more of the Sun’s direct raysSun’s direct rays
SunSun
SummerSummer
WinterWinter
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