ON THE FOURTH DAY G-D CREATED THE SUN, and it began to function as the center of our solar system. After approximately 365 1/4 days, the sun would be at its original place in the sky and a new year would begin, in a cycle that still continues without change. Tradition teaches that the sun's first appearance in the newly-created heaven is reckoned from Nissan, the month of Passover and springtime. A quarter of a year later — after about 91 days, 7 1/2 hours — the next season would begin and so on. If that very first year began...