Motions of Earth by pkg206

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									     WELCOME
      YOU ALL TO THE

INTERACTIVE SESSION
       ON THE TOPIC

THE MOTIONS OF EARTH
We Know That:

o Earth is Continuously spinning on its
  imaginary axis

o The axis of earth is not
  perpendicular but tilted to
  one side making angle of
       o
  231/2



o It is spinning from west to east
 o It completes one round in about 24 hours
This motion of earth is called
       ROTATION
Further, we know that:
Earth also revolves round the
 sun

It revolves in its fixed path called ORBIT

It takes 365 days and 6 hours, which
   makes one year

6 hours each year are added over a period
  of 4 years, which is called LEAP YEAR.
This is called the earth’s
   REVOLUTION                ORBIT




              SUN
    During Rotation, each part of the earth
    faces the sun
   The part which faces the sun has DAY and
   the other part has NIGHT

In this example:
Treat Lamp as Sun
So Front part of the earth is
lighted and has DAY
             and
Back side of the earth is not
lighted and has NIGHT
  The revolution of earth also causes
          different seasons
June 21: Rays of the sun are vertical at Tropic of Cancer.
        Called SUMMER SOLSTICE

Sept 23: Rays of the sun are vertical at the Equator.
         Called AUTUMN EQUINOX

Dec. 22: Rays of the sun are vertical at the Tropic of
         Capricorn. Called WINTER SOLSTICE

March 21: Rays of the sun are vertical at the Equator.
         Called VERNAL EQUINOX
           WINTER
           SOLSTICE




SUMMER
SOLSTICE
    So, today we learnt about
Axis of the Earth

Rotation of the Earth

Revolution of the Earth
How the Day and Night are made   AND

How the seasons are made
        And Now time to Check,
       what you have learnt today?
                                                       o
At what degree the axis of earth are tilted    231/2

In which direction earth is spinning           West to East

In how many time, it completes one round       24 hours

The path on which earth revolves is called..   ORBIT

On September 23, Rays of sun are vertical at   Equator
  which part of the earth

Name the season when Rays of the sun are       Winter Solstice
  vertical at Tropic of Capricorn.



                HAVE A NICE DAY!

								
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