Top Answer
User Avatar
Wiki User
Answered 2007-09-27 03:16:41

You need to know not only the relative positions of the Big Dipper stars on the sky, but also their distances. The positions of the stars are given in coordinates called right ascension (RA) and declination (Dec). The RAs are usually given in units of hours, which relate to how the sky appears to rotate once a day in (approximately) 24 hours. The Decs tell how far the stars are north of the projection of the Earth's equator on the sky. These positions are fairly easy to measure, by just noting where the stars seems to be in the sky as we see them. The distances to the stars are much harder to measure. The Big Dipper stars are close enough to the Earth so that they seem to move around in the sky a little bit when they are viewed at different times of the year from the Earth as it moves in its orbit around the Sun. This small change in position during the year is called parallax by astronomers. The farther from the Sun, the less the stars move around. The best parallaxes come from a space satellite mission called HIPPARCOS. The HIPPARCOS results show that the Big Dipper stars are between about 80 and 120 light years from the Earth, with errors of a light year or two. With the direction and distance to each star in the Big Dipper, one can then make a 3-D plot of the stars' positions. The stars at either "end" of the Dipper (at the end of the "handle" and the outside "lip" of the bowl) are the farthest away from us. The other fice stars in the middle turn out to be at almost the same distance (80 light years) from us. So, one should envision the ends of the Dipper being the farthest away from us, while the stars in the middle form a nearly flat pattern as viewed from the Earth. Answered by David B. Shaffer, Ph.D. in Astronomy, from Caltech.

User Avatar

Your Answer

Still Have Questions?

Related Questions

Does 3d comb filter in a tv mean it can play in 3d?

no it just means you're getting the best picture available for a 2D TV

Is there a way to take a 3d picture on a 3d ready laptop?


What is the DS3D?

it is a dsi but it has picture in 3d

Who can paint a real 3d picture?

I can

How do you make a picture 3D?

if drawing one simply take a red and blue crayon or marker after drawing the main picture in red take the blue crayon and outline the picture then take red cyan glasses aka 3d glasses and put them on and there is your own 3d picture made by you

Do 3D TVs only show 3D?

All 3D tvs show a better than average 2D picture.

Is black ops 3d compatible?

Black Ops is not in 3D but all 2D is 3D compatible with 3D HDTVs or the PS3 connected to a 3D HDTV. Your picture will just be in 2D on a 3D capable screen

What is the name of at least one book sold by Amazon that features at least one 3D picture?

The name of one book that is sold by Amazon that has at least one 3D picture is called 3D Picture Book in Grey Part 1 eBook. It is sold on their online website.

What does 2D and 3D mean?

3D means that the picture or movie has depth. Like, it looks like the picture is jumping out at you. 2D is like a drawing on a piece of paper. It has no depth.

Does 3D Comb Filter in a television mean it can play in 3D using a 3D player?

no it just means you will get the best 2d picture possible. it has nothing to do with watching 3d tv

What if someone with stereo blindness watches 3D TV?

If they are watching it with the 3D glasses, they will just see a normal 2D picture. If they are not wearing 3D glasses, much of the picture will be blurred or appear with ghosting doubles (just as the TV looks to people with normal vision without the glasses on). It is possible to disable the 3D effect in 3D Blu-Ray movies within the player or TV to allow the picture to look normal.

Can you put a giant polarized screen on your 3d tv to get the 3d image?

yes but the picture and contrast may be effected.

What is the full form of 3d sound?

Three dimensional picture

What is a 3d diamond?

it is a 3D shape with 8 faces 8 edges and 6 vertices if you want a picture of it type in pcures of 3D diamonds.

Will the PS4 play 3D movies?

The PS3 will play 3D movies on a 3D HDTV ot the new 3D display for PS3. There is no PS4 It will also play 3D games. You only need to buy the 3D games and a 3D HDTV and get the latest PS3 updates and any of the PS3s will play 3D. Without a 3D HDTV you can not get a 3D picture

I want to purchase a 3D tv, but I dont want to have to wear the glasses all the time. Is it possible to watch the TV without wearing the glasses or will the picture be distorted?

Yes, it is possible. Not all the content shown from a 3D TV will require you to utilize 3D glasses, and you can watch normal programs from 3D TVs. The picture will not be distorted unless you're watching a 3D film that requires special 3D glasses.

Is a Nintendo 3ds better then Nintendo DSi XL?

a 3ds is a dsi with 3D effect. a dsi XL is a big dsi. you can choose: 3D effect or being big. i would choose the 3D effect.

Is there any difference in getting effects between 3D movies and 2D-3D converted image with the help of 3D glasses?

There is a big difference between content shot in 3D and converted content. Any 2D to 3D simulation is no more than a simulation and does not have the same realism as true 3D. Some television manufacturers such as LG claim great results for their simulated 3D. Don't put too much faith into these claims but do get to a store where you can see real 3D and simulated 3D. You are by far the best judge to decide if it is worthwhile.

Can I watch a 3D TV without wearing the glasses?

Yes, it is possible. Not all the content shown from a 3D TV will require you to utilize 3D glasses, and you can watch normal programs from 3D TVs. The picture will not be distorted unless you're watching a 3D film that requires special 3D glasses.

What is a two-dimensional fire?

It is a picture of a fire. Real fires are 3D.

Who is the popper with big sunglasses in the movie Step Up 3D?

Madd Chadd (Chadd Smith) is the popper wearing big sunglasses in Step Up 3D.

Will PS4 need 3D tv to play games in 3D?

Yes it will just like the PS3. There is no PS4 until it is released forecast for December 31 2013, but without a HDTV with 3D capability to view in 3D you can not have a 3D picture. Everything will always need 3D HDTV or monitor to get 3D. The PS3 has 3D already if it has the latest updates, but just as you can not have a 1080P HDTV picture on a 480i standard TV you need a 3D TV to get a 3D picture. Most new top HDTV models from all the major brands are only available with a 3D capability even though you need not watch anything in 3D on them and can still watch everything including 3D programming in 2D. Just like a couple of years ago you needed to have 1080P if you purchased the top models the brands offered. Sony's newest top model is not only 3D but something they call 4K Ultra HDTV and said to offer 4 times the detail found on 1080p Full HD

What is the best 3D TV size for watching live sport in 3D?

I'm not a big 3D fan, but I do know that 3D pictures should take up your whole field of vision. This means that you need a big screen size to get the best possible 3D viewing. However, quality also depends on the room size and the 3D TV types. Cinema 3D TV has wide viewing angle that gives you broader viewing while watching the 3D TV.

Are 3D TV glasses are just like any other sunglasses and give full HD picture quality?

Yes, Passive 3D glasses allow full HD pictures in 3D mode.

What impact has the 3D industry had on society?

3D had a big impact on technology, because it was fun. intelligent. and at first expensive.

Still have questions?