A Concise History of Science in India c6.2

c6.2

It did not perhaps take the primitive man a long time to discover some kind of relationship between the cycle of his activities and the regularity of the heavenly phenomena. Thus were differentiated his day-time activities from the nocturnal. He noticed that his hunting seasons and, more particularly, his sowing times, when he settled down as a primitive agriculturist, depended on climatic changes or the seasons. He vaguely felt that these periodic changes were somehow connected with the most conspicuous of all heavenly bodies, the sun. In lower Egypt the periodical overflowing of the Nile was noticed to have some connection with the heliacal rising of Sirius.