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Mathematical sciences developed well in the Asian countries mainly in India, China & Arabian Peninsula during the period from 4th century to 12th century AD. Within this period, a galaxy of mathematicians & astronomers flourished in India who left their indelible mark on the history of Mathematical world. The most celebrated among them was Brahmagupta (598-669AD). His Sanskrit text Brahmasphuta-Siddhanta (628AD) greatly influenced the development of Mathematics and Astronomy not only in India but in the whole world. Brahmasphuta Siddhanta was translated into Arabic in 771AD by Arabian scholar AL-FAZARI under the title SINDHIND-AL-KABIR (the great Siddhanta) by the order of Bagdad Caliph Al-Mansur. This translation of Brahmagupta�s text opened the doors of study & development of Mathematics & Astronomy in Arabian regions and then transmitted to western world. In Brahmasphuta-Siddhanta, Brahmagupta gave some results which are considered unitue throughout the world. He gave formulae for sum to n- terms in A.P. Areas of prism, Cones, Pyramids, Cyclic quadrilateral etc. He also gave rules for operating with zero and infinity. His method of solving linear-indeterminate-equations is almost similar to the present day method. Brahmagupta�s method of interpolation of sines of intermediate angles is equivalent to the Newton-Stirling Formula upto second order differences. In the present paper, we have made efforts to high-light some salient features of the great Sanskrit text of Brahmagupta and have tried to prove that methods & formulae given by Brahmagupta in 628AD are, to some extent, similar and equivalent to the modern & formulae and are useful even today.