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I tried to go through internet Blogs , and some books but i couldnt get my head through this . I would be happy if someone explains me PARALLAX and how it is helpful to know large Distances.

Parallax, sometimes called "binocular vision", uses right triangles to measure distance. (Our brain and eyes learn the binocular vision as infants, intuitively, without the math!) A Wikipedia page is here: .

Also, since I teach a precalculus course and I like astronomy, I have a *short* video lecture on parallax here:

The parallax part of the lecture is at the end of lecture 4.4b. My students think I'm being overly nerdy when I get excited about astronomy!

those were some really good videos , Thank you Mr.Ken . I will recommend those to my friends who asked me the same question recently

Its just a basic Geometrical idea , which applied on wide scale can calculate Huge distances with pretty good accuracy .
I say , you do a little experiment right now . Just hold your thumb finger straight with your other finger wrapped in(like thumbs up position) and hold it between your eyes right in front. , now close one of your eyes and see the thumb with the other and do the same with your other eye , Do you see the apparent change in the position of your thumb? , This change becomes very very tiny as the distance between thumb and your face increases .
And now imagine your thumb a Distant Star and your eyes as the entire earth .Now when we see the same star from two opposite sides of the sun , there is apparent change in the position of stars , which only very sensitive instruments can detect and to this , we apply a little Geometry and there you go we can calculate the distance of that star from our solar system with very good accuracy.