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Sir Isaak Newton (1643-1727) was a brilliant English mathematician and physicist. It
is justly believed that he is one of the greatest men of science in the history of mankind.
Newtonean theory of universal gravitation and his formulation of the basic concepts
and principles of mechanics are known as his two great achievements. They have made
possible the creation of a physical picture of the Universe which remained unshaken
until the beginning of the 20th century. It is very important for us to examine, in some
detail, the concepts he introduced and clarified in the course of his work.
Ever since Galileo had invented his telescope men had been studying the motions of
the planets with ever increasing interest and accuracy. In particular, a great deal of
observed data had been collected by Tycho Brahe, a Danish astronomer (1546-1601).

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I would like to know why Isaak Newton was a brilliant English mathematician and physicist.
What is newtonean theory of universal gravitation?
Could you tell me why it is important to examine in detail the concepts introduced by Isaac
Newton?
4. Why are the planets describe ellipses, with the Sun being at a focus?
5. I was wondered why the radius vector joining the Sun with the planet describes equal areas
in equal times.
6. Please explain in more detail why the cubes of the mean distances of the planets from the
Sun are proportional to the squares of their times of revolution.
7. What is the name of the principal supplied by Isaak Newton?
8. Can you repeat once again the name of the work published by Isaak Newton?
9. Why is it important to know Newton's three laws?
10. What else is Isaak Newton known for?

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