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Showing posts from May, 2019

Solstice and equinox

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Solstice and equinox
The  earth has two main motions :

1. Rotation        2. Revolution

The Axis of the earth , which is an imaginary line makes an angle of 66 1/2 ° with its orbital plane.The plane which is formed by the orbit is known as the orbital plane . The earth receives light from the sun .Due to the spherical shape of the earth , only half of it gets lights from the sun at a time. The portion facing the sun experience day while other half away from the Sun experiences night. The Circle of Illumination is a circle that divides the day from night on the globe. The circle does not coincide with the axis .


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Rotation The earth rotates around its axis . The axis is an imaginary line passing through the centre of the earth. The earth completes one rotation in 23 hours , 56 mins , 4.09 seconds to be exact .The earth rotates from west to east . This period of rotation is called as the Earth day.
Rotation of earth There are several  effects of the rotation o…

Solar System

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Solar system definition The sun along with eight planets , asteroids, and comets comprise the solar system. Such kinds of  planets which have greater densities known as inner or terrestrial planets . e.g . Mercury , Venus , Earth , and Mars and outer planets which have lower densities are Jupiter , Saturn , Uranus and Neptune.
The Sun The sun lie in the centre of the solar system.
The sun is made up of extremely hot gases mainly hydrogen..
The sun is 10^9  times bigger than the earth and weighs 2× 10^27 tonnes.


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The sun is approximately 150 million km away from the earth . The light from the sun reaches the earth in about 8 minutes.
The shining or glowing surface of the sun is called Photosphere . Above the Photosphere is red coloured Chromosphere . Beyond the Chromosphere is the Corona  visible during eclipses.
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The temperature of the photosphere is about 6000℃  and that of the Chromosphere is about 32400 ℃ .The Sun…