VIEWS: 169 PAGES: 10 CATEGORY: High School POSTED ON: 5/26/2010
The present powerpoint presentation was made for my son as part of his school project and the same is about the rotation, revolution, formation of day and night and seasons. It is tutorial made for 6th-7th standard students.
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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