Centre of Gravity

Centre of Gravity : The centre of gravity of a body is that point through which the entire weight of body acts.

The centre of gravity of a body does not change with the change in orientation of body in space.

The weight of a body acts through centre of gravity in the downward direction.

Hence a body can be brought to equilibrium by applying a force equal to its weight in the vertically upward direction through centre of gravity.



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Constitution

Constitution : Constitution is the foundational law of a country which ordains the fundamental principles on which the government or the governance of that country is based.

It lays down the framework and principal functions of various organs of the government as well as the modalities of interaction between the government and its citizens.

With the exception of the United Kingdom, almost all democratic countries posses a written constitution.

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Our Galaxy : Milky Way Galaxy

Milky Way Galaxy was formed 5 billion years after the big bang. Latest known galaxy is the Dwarf Galaxy. Origin of the universe is explained by the Big Bang Theory, formulated and proposed by the Belgian astronomer and cosmologist Georges Lemaitre. Andromeda is our nearest galaxy.

Big Bang

Mesopotamians

Mesopotamian Civilization : In astronomy, the Mesopotamians made astonishing progress. They could calculate the length of the day and the night.

Mesopotamians divided the whole day into 24 hours. They divided the sky into 12 parts, each assigned a name. This has come down to us as the 12 signs of zodiac.

Another remarkable achievement of the Mesopotamians was the invention of a lunar calendar, based on the moon.

Firsts in the world

» First man to reach South Pole : "Ronald Amundsen"
» First religion of the world : "Sanatan Dharma"
» First person to sail around the world : "Ferdinand Magellan"
» First University of the world : "Taxila University"
» First Woman to climb Mt. Everest : "Junko Tabei (Japan)"