|
|
| 26 Jan 2015 05:49 AM
|
So, you see, the Earth rotates on its axis. And when it rotates, that means it also moves around the Sun. However, the Sun is very big, and it takes up a lot of space in the sky. So, if you were to stand still while the Earth rotated, you would be in front of the Sun for half of the day, and then behind it for half of the day.
But if you move with the Earth as it rotates, you would always see the same side of the Sun (which is very bright), which would mean that you wouldn't see the night side of the Earth, or the dark side of the Sun. That is why the day starts when the Earth is facing the Sun.
The way the Earth moves around the Sun is called "orbital motion." And the fact that the Earth has orbital motion is called "the Copernican Principle."
Now, when people talk about the Sun coming up, they are actually talking about the Sun coming into view, not actually rising. You can think of it like this: When you drive down the highway, the trees come into view as you approach them. This is true even if the trees aren't actually growing closer to you. In the same way, the Sun comes into view as the Earth orbits around it.
However, I should point out that the Sun doesn't really rise and set at all. The Earth is a spherical planet, so there is no place on the surface where the Sun's rays will fall at exactly 90 degrees above the horizon. In other words, there isn't any place where the Sun will appear to rise or set.
But the way that the Sun appears to move across the sky does have some interesting implications for astronomy. For example, as seen from Earth, the Sun appears to be traveling through space. However, according to the laws of physics, the Sun actually orbits around the Earth. So, why do we see the Sun moving through space? Well, the answer is that our perception of the Sun's location has nothing to do with the physical location of the Sun in the Solar System. It has everything to do with how we see the world, and how our senses interpret what we see.
When we look at the night sky, we see a bunch of stars that are millions of light years away. But when we look at the day sky, we see the Sun, which is only about 93 million miles away. So, it seems like the Sun must be much closer than all of the other stars in the sky. But actually, the Sun is not really closer than the other stars. It just seems closer because we can see it without using a telescope.
The reason we can see the Sun during the daytime is because light travels through space at the speed of light. And light can travel through the atmosphere in space. So, if you were to point a telescope at the Sun during the daytime, you would still be able to see the Sun. However, because the Sun is so bright, it would probably be too bright for your eyes to handle.
In fact, the Sun is so bright that even if you could use a telescope to view the Sun, you would probably have to wear special protective glasses to protect your eyes. This is because the Sun gives off ultraviolet radiation, which can damage your eyes.
|
|
|
|
|
|
|
Report
Abuse
|
|
|
|
|