Monday 19 August 2013

How long is a day on each planet? How long is a year??



A day is the time it takes a planet to rotate once. Earth takes 24 hours. Since each planets rotates at different speed, the length of the day differs. A year is the time a planet takes to rotate around the sun in Solar System. Earth takes 365 days to revolve around the Sun. Each planets revolve around the sun at different speeds.
Here is the time taken by each planet to rotate and revolve. The time is given in Earth days, Earth years and Earth hours.


          PLANET                  ROTATION               REVOLUTION AROUND THE SUN
                                             (in hours/days)                                (in days/years)


  • Mercury                         59 days                                         88 days
  • Venus                          243 days                                       225 days
  • Earth                              24 hours                                     365 days
  • Mars                               26 hours                                     687 days
  • Jupiter                            10 hours                                        12 years
  • Saturn                            10 hours                                         30 years
  • Uranus                           17 hours                                        84 years
  • Neptune                         18 hours                                      165 years



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