Why is it so bright in the morning and so dark at night?
The earth is shaped like a round ball. And this round earth keeps rotating slowly like a top. The earth rotates once a day from west to east with the line connecting the north and south poles as its axis.
Let's replace this with something simpler. Suppose we have an apple. Assuming that this apple is the earth, think of the apple's base, or stick-like part, as the North Pole and its rim as the South Pole. When we look at the apple from above, the apple, or the earth, turns once a day in the opposite direction of the hands of a clock. Now, suppose there is a table in a dark room with an apple on it. On top of the table, there is an electric lamp a short distance away from the apple. What happens when you turn on the light on the lamp? The answer is that the area on the surface of the apple that is illuminated by the light from the lamp will be bright, and the area on the other side that is not illuminated will be dark. In this case, the apple is the earth and the lamp is the sun. The part of the apple that is illuminated is daytime, and the part on the other side that is not illuminated is nighttime.
By the way, the earth rotates like a top, and eventually the sun's rays will shine on the previously dark areas, making them brighter. This is when it is morning. Conversely, there will naturally come a time when the areas that used to be illuminated will no longer be illuminated. This is the evening. Let's try this experiment with a round object and an electric lamp.
