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Seasons - PowerPoint PPT Presentation


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Seasons. The ear t h ’ s a xi s , wi t h r es p ect t o the plane of i ts orb i t, is actua l ly t i l t ed a t an angle of about 23 . 5 deg r ees .

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slide2

Theearth’saxis, withrespectto the plane ofits orbit,isactuallytiltedat anangle ofabout23.5degrees.

Thistiltofthe axis is thereasonwehave different hours ofdaylightthroughoutthe year aswellas differentseasons.

slide3

During the summer,thenorthernhemisphere istiltedtowardthe Sun. Duringthewinter,thenorthern hemisphere is tiltedawayfromthe Sun.

slide4

Whenthenorthernhemisphere is tiltedaway fromthe sunduringthewinter,thesunlightstrikes the Earth at a veryshallowangle, spreads out, andislessintenseat any given spot.

slide5

In thesummer,whentheSunishigher inthe sky, the Sun’sraysshinedirectlyontothe Earth makingthe lightmoreintenseleadingtohighertemperatures.

slide6

Another way thatthe tilt of theEarth causes the seasonsistodo withhowlongtheSunstaysin theskyeachday

slide7

Inthesummer,since theSunishigher in the sky,ittakeslongerto travelfrom one horizontothe next. SincetheSunshines onthe Earth for a longertime period, the ground,air,andwater, becomewarmer.

slide8

Inthewinter, the Sun sitslowerin thesky, soittakeslesstimeforittotravel from horizontohorizon. Since theSunshines onEarth for ashorter period oftime,the ground, air,and waterstaycolder.

slide9

During the winter,sunlightdoesn’t reachtheNorth Poleat all.SotheSunneverrisesanditstays dark all day.

  • In the Summer, theSunneversetsat the North Pole, soitstays lightall day.
slide10

Bothpoles, the northandsouth, experience6months ofcomplete darknessand6 months ofcomplete daylight.

South PoleinMarchwithAuroraAustralis PhotobyPatrick Cullis,NationalScienceFoundation.

slide11

St.Petersburg,Russia,experiences18hoursof daylightfrom May untilJuly. They call thisperiod the “WhiteNights.”

St.Petersburg,Russia

St.Petersburg,Russia WhiteNights

slide12

Becauseofthe tiltofthe Earth, theseasonsinthesouthernhemisphere areexactlyopposite.- So,seasonsvarydependinguponthelatitude.