Raoul asked:

"And why does it have an anticlockwise rotation? Mystery... "

I believe(?) the Venusian rotation rate might be phased with the Earth's orbital period. Venus is so close to the Sun that there is a tendency for it to spin lock with the Sun like Mercury or the Galilean moons with Jupiter.

The Earth once had a much faster rotation rate (a much shorter day). This was due to the angular momentum the Earth acquired after colliding with a Mars sized world that vaporized the Earth's surface while disintegrating into a ring that eventually formed into the Earth's Moon. This angular momentum has over the eons been slowly transfering back to the Moon causing its semi-major axis to increase along with its orbital period. In essence, the Earth's day gets longer causing the month to grow longer as well.

Gary