Answer 1 question: March is the answer cause June would be to hot while January would be to cold! so if it was November it would work but not just quiet! cause it would get colder from average more and more so it would be March cause the temperature is perfectly warm and balanced and will stay in that temperature!
Answer 2 question: Earth rotates Because the hydrogen atoms inside the nebula fused to form helium.
Hope this worked! Stay safe!