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please make it simple for me to understand. and, if possible, make the units as if your solving parallax for object within your home. thx alot

2007-02-27 23:18:44 · 3 answers · asked by snaily 1 in Science & Mathematics Astronomy & Space

3 answers

Parallax is an optical effect that can be measured and used to cacluate a distance. Since this is the astronomy section, I will assume that is what you are looking for.
The fundamental basis of parallax is the "skinny triangle" approach.
You observe two objects that appear to be in close proximity to each other, but at a distance away from you. In your home, if you place a lamp (without the lampshade) in front of a window and then go stand on the far side of the room in one corner so that you look diagonally across the room at the lamp, you will see the image of the light bulb abainst the window panes. Try drawing this out on paper or taking a digital photo of the view. Then go to the other corner of the room and do the same thing. Notice that the image of the bulb has shifted against the background of the window. This is parallax. We do the same thing with stars that are fairly close to us (the light bulb) and stars that are much farther away (the window panes). If we know the distance between the two places we were standing, we can measure the angle that the image of the bulb has shifted and use trigonometry to calculate the distance to the bulb (or in the case of astronomy, the nearer star).
In astronomy, we measure the angle that a star's parallax has shifted over the course of six months. We know that the distance between the two points of observation is 2AU and so a right triangle can be drawn from the earth to the sun to the distant star. The base of the triagle will be 1AU and the angle opposite that base is 1/2 the parallax angle. Since the distance between the sun and the nearby star is the long leg of the triangle, you can say that the tangent of (1/2 the parallax angle) is equal to 1AU/distance to the star.
The other way you can calculate the distance is to use the parallax angle compared to 360 degrees is equal to 2AU compared to a circumfrence of a circle centered on the nearby star and the radius of that circle will be the distance from the star to the sun. That is to say x/360degees = 2AU/2(pi)r where x is the parallax angle and r is the distance from the sun to the nearby star.
I hope that helps.

2007-03-02 00:20:33 · answer #1 · answered by sparc77 7 · 0 0

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2016-10-16 22:33:27 · answer #2 · answered by Anonymous · 0 0

Parallax is a relationship among three objects.
You,the first object and the second object.
As you change position it is the apparent positions of the other two objects.in relation to your position.

2007-02-28 01:07:35 · answer #3 · answered by Billy Butthead 7 · 0 0

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