Why does the sun rise and set ?
because the earth rotates and light covers only half part of the planet which is tilted. One day means 1 rotation on itself and the part where you live comes on the dark side where no light reaches. this involves too why there are seasons because while earth rotates on itself it orbits the sun so some days will be with more sunlight or less sunlight. but to get it more see these sites http://www.nasa.gov/audience/forstudents… http://www.windows.ucar.edu/tour/link=/k… http://www.dailygalaxy.com/photos/uncate… http://divulgence.net/AxialTilt.jpg http://www
