Why can all on the earth not see the sun at the same time?

First of all the earth is on an axis that slowly spins everyday. making it impossible for both sides to have the sun on all of it everyday. Second is that we rotate around the sun so only one part can have the sun on it. The way sunsets and sunrises come up are because the earth is turning making us see part of the sun but not all of it. That is also why we have seasons and why there are different time zones. It is because the earth is always turning. Take your hand for instance if you tilt it to the side and go outside, only one part of your hand will have sun on it. If you turn your hand some than a different part of your hand has sun that is kind of how the earth works.