if the earth rotes around the sun,why we see the stars in the same position every day?

Question

the stars in the east still in the east and the others in any diriction we see them in the same location
and you know that people in the past was using stars as guid for dirictions on the land or sea
do we have explication?

Answer 1

Actually we do not see the stars in the same place each night, except for the north start and it is not exactly in the same place. It is not readily apparent on a day to day basis but each night the stars shift their positions slightly. It is very noticable from month to month. If you find Orion in the December sky, a very noticable constellation because of the belt of three stars, you will notice that On December 1 it will be the same place in the sky as it will appear two hours earlier on December 31.

Answer 2

The stars are not in the same position every day. They appear to be in the same position from one day to the next, but over the course of a year, the stars (the constellations) rotate across the sky (and this is caused precisely because the earth rotates around the sun).

As for using the stars for navigation, all the constellations rotate around a single point approximately over the north pole, and some constellations (like the Big Dipper, Ursa Major) have stars that are lined up in the direction of this point of rotation, and in fact there is a star at approximately that point ... we call it the North Star. The constellations help navigators find North, and their stability from night to night, and the fact that their precise positions can be charted and predicted based on the time of year, also helps locate East and West at night. In the southern hemisphere there are other constellations (like the southern cross) used for this purpose.

Answer 3

There are two motions at work here.

1 - Rotation. The earth spins, and at about the same time every day, we are facing about the same direction we did yesterday. So little changes from day to day, at the same time each day.

2 - Revolution. The earth revolves around the sun, so what you see at the same time each day changes a little bit each day. But each year, the stars will return to the place they were exactly one year ago.

Knowing where the stars are, along with the day of the year, can help you determine how far north and south you are. Couple with the time, and you can determine how far east or west.

Answer 4

Another aspect you may be missing is that we only see stars at nght which is when we are facing away from the sun. So that means, even though we are spinning around every day, we are only going to see the stars in one general direction for a few months at a time. As we slowly go around the sun, we will see different constellations until we are on the other side of the sun (6 months later) and then it starts all over again.

Answer 5

It is actually an amazing experience to watch the night sky over the course of a year and see the stars shift over that period of time. Stars that you see in the east right now will be above in a couple of months and in the east a couple months after that. Then you won't see them for a while. After a while longer, you will see them again in the east. If you have a good star chart, you can learn the constellations over the course of a year.

Answer 6

Perception is different than reality. The stars seem to be in the same general position because, while the earth moves vast distances during it's rotation around the sun compared to the distance away from the stars we are looking at it might as well be standing still.

If you were to download one of those astronomy programs you would see that the sky does change slowly over the year as we orbit, and in fact changes greatly over long periods of time, the night sky a few hundred thousand years ago doesn't resemble ours.

Answer 7

consider that the earth's distance from the sun is one A.U., which is 8 light minutes.

consider now that the nearest star is many light YEARS away.

Now think about the triangle formed by the star you're looking at, the sun and the earth (a right triangle with the sun at the vertex of the right angle when the earth is furthest out). Think about the angle of which the star is the vertex. I'm not going to bother calculating it, but it changes so very little because it's such a tiny angle in the first place, that for all intensive purposes, the stars "don't move." Or at least not enough to throw off our calculations when using them as a frame of reference.

Answer 8

Actually the stars are in the same position if you wait an additional 4 minutes each day. So in the course of several days the stars will totally change and you will not see them at night any more.

Answer 9

They do rotate, if you stay up all night and pinpoint a star and you look for that same star 3 hours later it will not be in the same spot. Try pointing a camera to the night sky and leave the shutter on all night, take the picture and get it developed and you'll see nothing but white streaks across the sky.

Answer 10

The further away an object is, the less it seems to move in relation to the observer. For example, the moon seems to "follow" you as you drive a car. In cartoons they mimic this effect , called "forced perspective" and show distant background objects moving by more slowly than closer background objects. Stars are about as distant a thing as there is...

BUT there is an effect called "parallax" where the motion of the earth causes the stars to seem to "wobble" in place as the Earth moves around the sun.