I'd like to ask about this question. Compare the atmospheres and rotation rates?

Question

(how long is one day?) of Mars and Venus to that of the Earth. How is are they similar to Earth? How are they different?

Answer 1

Hi. Mars is very close to Earth in its rotation period. Venus is way different, something like 240 days for one rotation. From the web "Venus' rotation is somewhat unusual in that it is both very slow (243 Earth days per Venus day, slightly longer than Venus' year) and retrograde. In addition, the periods of Venus' rotation and of its orbit are synchronized such that it always presents the same face toward Earth when the two planets are at their closest approach. Whether this is a resonance effect or merely a coincidence is not known."