why does the sun go down?

Last summer, my curious, 4-year-old cousin Sloan asked mom why the sun goes down? Mom, thinking it best to always tell the truth to a 4 year old, decided to try to explain the solar system and the orbit of the earth around the sun and how the earth spins on an axis thus exposing the sun to one side of the earth and then to the other.  when all she really needed to say was that the sun goes down each night so it can come up the next morning....

It was a sunny fall day in Seoul, after an afternoon of touring around the palaces that are placed in various areas smack dab in the middle of Seoul.  It is such a beautiful thing because there is the hustle and bustle of the city happening all around, and then you enter into these gardens where the palaces are and you are transported into another quiet world.  well we were taking a cab back to another part of seoul called Itewan, where we were going to have dinner.  our cab was in the left hand turn lane, a couple cars back, and we were on a fairly big street so there were 3 lanes of traffic on either side.  the traffic and pedestrians are nuts here, people always darting to make the light to cross the street, and cars always running red lights or speeding and swerving in and out of traffic.  well the light turned green for our lanes of traffic to go, right as a little girl, holding ice cream, and wearing a pink little sweat suit, was finishing running across the road.  we saw her scurry in front of the line of busses, and all held our breaths.  all of a sudden one of the busses stopped, and we could see everyone on the bus standing up, and some covering their faces or their mouths.  we looked down and saw the little girl laying in the street next to or under the bus, and her pink little body was not moving.  my heart sank so low in my chest, it has never reached that point in my body.  i felt so sick and so sad.  all of a sudden it was our turn to go, and the cab proceeded forward, turned left, and we were onto another street and on our way with our journey.  just like that, our world kept moving, the earth kept spinning, the sun kept moving in the sky and soon went down.  The little girls fate I will never know.  but the sun went down and came back up the next morning just like it was supposed to.  

I was so saddened by that sight, and I will never forget what happened that saturday in Seoul.  It mainly made me realize that the world does keep going.  all day i have been thinking about her family, and her, and all of the possibilities of what could have been the outcome of that accident.  Did they spend the whole night in the hospital? Was she dead right there in the street? Did she stand right up and brush off her pink sweat suit?  I will never know.  All I know is that the sun is going to go down every night, and come up again in the morning, and i just have to be thankful every day that I am here and healthy and happy and just keep going.