All the planets in the solar system rotate anticlockwise, except one. Venus is the only planet that rotates clockwise. Venus (radius 3,760.4 miles) is similar to Earth (radius 3,963.19 miles) in size and structure but spins very slowly; a day on Venus is 243 Earth days long.
Earth is the densest (5.515 g/cm3) planet in the solar system and the only one not named after a god. Earth orbits the sun at an average speed of 66,629 mph (107 229 km/h). One year on earth is 365.24 days long. One day is 23 hours, 56 minutes and 4,06 seconds long. The extra day in a leap year was introduced to compensate for the discrepancy in the Gregorian calendar.
It’s easy to remember the order of the eight planets with this line: My Very Eager Mother Just Served Us Nachos. The capital letters stand for the order of the planets, starting closest to the sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
And remember too, that earth is not completely round; it is slightly pear-shaped. The North Pole radius is 44mm longer than the South Pole radius.