why sun set

yes you are right its a rule of nature. we cant stop it. i always learned one thing from it that.. "help people as much as you can.. just like SUN do.. someone always come there to help people behind us.. just like MOON do. Wishing You and your family a very happy Christmas.. have a nice day, take care.

Yes, the sunset is one of many rules of nature. In addition, if the sun never sets then one half of the world would always be dark and the other half would always be light. This would through off climates, global warming, and a whole list of other things.