How day and night manifest themselves?

Answer 1

Clearly, when you see the Sun shining in the sky, it is day, and when you don't it is night. So the real question is "why is the Sun in the sky at some times and not at others?" We can see that the Sun seems to move across the sky starting in the east in the morning, moving toward the south at noon, and then toward the west as the day ends. How does this happen?

Long ago, people believed many weird things about the Sun and how it traveled across the sky. The ancient Greeks believed that the Sun rode across the sky in a chariot drawn by four white horses driven by the god Heleius! These days, we know that the Sun appears to move across the sky because the Earth rotates on its axis.

So how does the turning of the Earth lead to the Sun's motion across the sky? It is easy to see this if you shine a bright light on the side of a globe in a darkened room. Find where you live on the globe. Now slowly spin the globe on its axis so that if you look down on the north pole, it is rotating counterclockwise. Watch what happens to the place where you live. Do you see that it is sometimes pointed toward the light (which represents the Sun) and sometimes away from the light? Hey, you've made day and night!
When where you are is pointed toward the Sun, it is day. Then the Earth rotates you away from the Sun, and it is night.

Think about this!

So, how fast does the Earth have to rotate in order to make one complete spin in 24 hours? At the equator, the Earth is rotating at a speed of about about 2200 kilometers per hour. Good thing we human beings can't feel this motion!

Answer 2

The moon doesn't really tell us anything. It is just a reflecter. The sun's rays are hitting the moon, and the moon reflects the light. We call it night because the Earth is rotating and it rotates away from the sun so the moon (and stars) are the only sources of light in the sky.

Answer 3

The earth rotates on it's axis, and as it does that, the sun appears on different places on the Earth. It spins to the right, so the sun looks like it's rising in the east , and setting in the west. Once it is completely out of sight, it will take 12 ours or so to come back in the west. How this happens is that when it rotates, the sun will stay in one place, and its not moving. Spin in front of any object in your room. Pretend the object is the sun, and you are Earth. It's not going anywhere, but it looks like it, because YOUR moving, not the object.

Answer 4

the earth rotates on its axis as it rotates the sun comes around.

Answer 5

it is day when it is light and it is night when it is dark

Answer 6

The turning Earth.

Answer 7

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