The radius of Venus is 6,052 kilometers, which is
only slightly less than Earth's. This smaller size,
along with slightly less mass makes the surface
gravity of Venus 90% of Earth's. If you walked
around on the surface, you might not notice the
difference.
First of all, Venus rotates backward, or retrograde, unlike
any of the other terrestrial planets. It take 243 days to
spin once, which is sometimes expressed as -243 days.
The time from noon to noon, or the synodic day, is 117 of
our Earth days.
Venus' orbit is a little less than 3/4 of the size of Earth's. It
orbits the Sun in just about 225 of our days. That would
be the length of the year on Venus. Venus' orbit is one of
the most circular in the solar system with an eccentricity
of only 0.0067.
The atmosphere of Venus does not smell very good. It is
95% carbon dioxide, and a few percent nitrogen. But it is
the sulfur dioxide which gives the planets its wonderful
rotten egg smell. The pressure at the surface is 92 bars
with just the slightest wind.
