Here the two positions of the Earth are marked with light blue circles, and the position of the Sun is in orange. This tells us that we can use this phenomenon to measure how far the object (our finger) is from us. The closer your finger is to your eyes, - the larger the parallax shift relative to the remote object when you compare the view from each eye. If you now try to do the same experiment but keep your finger closer to your eyes, you will notice that the shift of your finger relative to the distant object is different. Did you notice that your pencil or finger moved relative to the other object? The fact that it moves is the manifestation of parallax. Now close this eye and open the other one. Note how far this finger is from another object in the distant background (say, a tree, if you are outside, or a piece of furniture if you are indoors). Here is an easy way to see parallax in action: hold up one finger and close one eye. It is manifested when observing an object from different points of view against a more distant background. Parallax is a geometric phenomenon used in distance calculations. We have discussed stellar parallax in the article on length and distance but let us briefly look at it here as well, because it is fundamental in measuring distances in space. In other words, a parsec is a distance, from which a disk with a diameter of one astronomical unit will have an angular size of one arcsecond. A parsec is defined as the distance at which an object has a 1-arcsecond stellar parallax. Where D is the actual distance measured in parsecs and p is the observed parallax angle measured in arcseconds.
The parallax of a celestial body can be used to find an approximate distance using the formula These two separated points are situated on the Earth’s orbit and created by two different orbital positions of Earth as described below. Stellar parallax is the difference in direction of a star as seen from two widely separated points. It is measured by the angle or semi-angle between the two lines of sight from an observer to the object. The parallax is the apparent change in the position of an object resulting from a change in the position of the observer. Definition of Parallax and the Formula for Distance Calculation
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