Following are the different types of the Earth movement:
Orbital motion:
The earth revolves around the sun in a particular path
called its orbit. It takes 365.25 days to complete it path around the sun. The
earth year is 365 days long and extra 0.25 days added after every fourth year.
The shape of orbit is not circular, it like an oval shape.
The distance from sun varies during the motion. The earth is closest to the sun
in January about 91.4 million miles. It is farthest away from sun in July about
95 million miles.
Axial motion:
The earth is also rotating on it axis west to east and take
24 hours to complete round on it axis. The side of earth that faces the light
of the sun has day time and the other side of earth has night time.
Why different seasons on the earth?
The earth
axis is tilted slightly at angle 23.5°. Due to this position it gives us four
seasons (summer, spring, winter and autumn). The sun rays hit different portion
of earth differently depending upon position of earth during it orbital motion.
The earth position is so that it tilted
slightly toward sun (from June to august). The sun rays hit directly on
northern hemisphere result summer in this region and winter in southern
hemisphere.
The earth
position is so that it tilled slightly away from the sun (from December to
February). The northern hemisphere is little away from the sun. The sun rays
hit less directly result winter in this region and summer in southern
hemisphere. There is no difference between summer and winter close to the
equator.
The earth
position is so that the sun shines equally on both hemispheres (from September
to November). The result is autumn in northern hemisphere and spring in other
region.
The earth
position is so that the sun shines equally on both hemispheres (from March to
May).The result is spring in northern region and autumn in other region.
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