Humans use lots of water. We need it for various activities, including agriculture, transport, washing, and recreation. Most important, we need to drink fresh water to stay alive. Today, in many regions around the world, fresh water comes straight to where we need it. But in some places, people must carry gallons of water from the closest stream, river, lake, or well to their homes.
The sun rises in the east and sets in the west. This we know from personal observation. But have you ever thought about where the sun is in the sky at the same time each day?
You might think the sun would appear at the same place at the same time each day. This would be true if Earth had no tilt and its orbit were a perfect circle. But this is not the case.