Newton (1642-1727) made a special study of the solar system, discovering laws governing the revolution of planets around the sun. His study was, however, confined to astronomical bodies, which can be called the macro¬-world. It is possible in the macro world to weigh and measure things. As a result of the immediate impact of these discoveries, many began to think along the lines that reality was observable, and that proper and valid argument was one based on observation. It was under the influence of this concept that the philosophy generally known as positivism came into being.