Not all the planets move at the same speed. The earth spins on its axis once every twenty-four hours. At the same time it moves round the sun, taking 365 days, or thereabouts, to complete a year’s full circuit. Mercury is the planet nearest to the sun. It revolves round the sun in only eighty-eight earth days. So its year is much shorter than ours. On the other hand, each day on Mercury is incredibly long because the planet spins very slowly on its axis. In fact, for anyone standing on a fixed place on the surface of Mercury, the gap between one sunrise and the next would be 176 days, or two Mercurian years.
Picture Credit : Google
