how come the earth is round how can u prove it scientifically?

Answer 1

1. Eclipses, and lunar phases.
2. The other "celestial" bodies, like the sun, moon and planets also appear round. One might assume, that the earth might be also.
3. Gravitational laws based on the earth being a certain shape and size, predict movement, etc.
4. The stars in the southern hemisphere are different than in the northern hemisphere.
If the earth was flat, one should be able to see the all of the stars at least some of the time.
5. Sailors regularly circumnavagate the earth.
6. Planes regularly fly around the world.
7. The seasons and the climatic zones are hard to explain otherwise.
8. The coreolis forces of hurricanes.

One can use scientific method to prove all of these and come up with conclusions for an earth that is somewhat round in shape, if one isnt lucky enough to see it from space, and believe it with your own eyes.

Answer 2

If you mean how do we know it's not flat, it's not because of the space photographs. Yes, they make for convincing evidence, but there was proof that the world was round long before our time. A few examples:

1) Ancient Greek scientists observed that the shadow cast on the Moon during a lunar eclipse was alwas circular. Theorizing that the shadow was cast by the Earth, they reasoned that the Earth must be round because if it were flat, it would cast an elliptical shadow. (Try it sometime with a dinner plate and a flashlight--unless the flashlight is directly under the center of the plate, the shadow won't be circular.)

2) Ancient Greeks (they did most of the philosophizing back then, it seems) also noted that when a ship approached from across the ocean, the sails became visible before the hull. They realized that this could be caused by a round Earth, whereas if the Earth were flat, the ship would first appear to be a speck in the distance, then all parts of it would become visible at once.

3) Yet another ancient Greek philosopher, suspecting a round Earth from the previous two points (which admittedly only suggested, not proved, the idea), actually conducted an experiment to determine the Earth's size. He knew that at noon on the day of the summer solstice, the sun would shine directly down in a particular city (presumably one on or near the Equator). He sent a friend of his north to another city with instructions to measure the length of the shadow cast by a stick at that time. He was able to calculate the angle of the Sun's rays by this measurement, and from that angle, he came up with a figure for the Earth's size. It was larger than the currently accepted figure, but if the Earth were flat, there would have been no angle whatsoever.

4) In the Renaissance, many navigators set out to circumnavigate the globe. Although some did not succeed, the fact that any did is proof that the Earth is flat.

5) In the modern age, it is possible to fly from America to Asia by going over the Pacific Ocean, or to fly from America to Europe and drive to Asia. Thus, you can reach the same destination by going east or west.

6) Finally, the existance of time zones supports the round Earth. If the Earth were really flat (and, presumably, the Sun orbited it), then all parts of the Earth would have day and night at the same time.

Answer 3

Actually, the Earth is not really round, it's spheroid because:
- The invention of the compass and the return of Columbus prove that.
-When Newton measured the force of gravity, that number could then be tested anywhere the theory was known. Since the force of gravity is roughly the same everywhere on the globe, it could be surmised that the Earth must be spherical.
-If the Earth were not round, whole hemispheres would have different atmospheric pressure and significantly different sea levels

As you can see, the picture of NASA about the Earth prove that our globe is round.

Now, you get it?

Answer 4

You can observe the roundness if you go to the ocean and wach a ship come over the horizon. Because the Earth is round (it's not a perfect sphere but it's close),the ship looks like it's rising over the horizon similar to when the sun rises. If the Earth were flat, you could see the entire ship the whole time and it would just get bigger.

Answer 5

The Earth is not round. It's a spheroid, because it rotates on its own axis. The Earth has it's roundish shape because it's been pulled by its own gravity, equally in all directions.

Answer 6

the earth is in fact flat!

http://en.wikipedia.org/wiki/Flat_Earth_Society

http://www.alaska.net/~clund/e_djublonskopf/Flatearthsociety.htm

the 2nd url is the actual proof

Answer 7

because we've seen it from outer space before. we see it and other planets from our space telescopes as well. we know it's round because of eyewitnesses and photos taken from space.