Yesterday afternoon, the moon was at the border of Russia and Canada in the Arctic. It took about 30 seconds from rising to setting, then blocked the sun for 5 seconds, and finally set immediately... If there were no Internet, perhaps we would never see this natural wonder in our lifetime. It turns out that this is the legendary: the alternation of the sun and the moon, the movement of the stars. Perfect and beautiful! This is a natural phenomenon, and even more a natural wonder!