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