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Some data on Venus

by Pierre Causeret last modified Jul 12, 2012 03:14 PM
Contributors: Florence Trouillet

 

Orbital characteristics

  • Orbital period: 224.7 days
  • Synodic period: 583.9 days
  • Average distance to the Sun: 108,200,000 km
  • Perihelion: 107,500,000 km
  • Aphelion: 108,900,000 km
  • Eccentricity: 0.007
  • Inclinaison to ecliptic: 3.4°

 

Physical characteristics

  • Radius: 6,052 km
  • Mass: 4.87×1024 kg
  • Surface gravity: 8.9 m/s2
  • Surface temperature: between 450 °C and 500 °C
  • Atmosphere composition: more than 96 % of carbon dioxide, more than 3% of nitrogen
  • Sidereal rotation period: 243 days (earth days) measured anticlockwise.
  • Solar day: 117 earth days.
venus rotation 117 v1 or venus rotation 117 v2


Difference between sidereal day and solar day


For the character at the bottom, facing the Sun, it is noon in solar Venusian time.
After 117 earth days, Venus has rotated 187° around the Sun measured anticlockwise (117 × 360° / 224.7). Moreover, Venus has turned 173° on itself measured clockwise (117 × 360° / 243), which is the same as 187° measured anticlockwise.
Result: the character finds himself facing the Sun, it is noon for him again.


Note:
The atmosphere of Venus rotates in four days around the planet in the clockwise direction as the planet itself rotates in 243 days.
The soil of the planet is hidden by its thick atmosphere, we were able to determine the rotation period of the ground by using a radar.

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