How to find the distance between star and earth:- mathmasters.in

There are 2 method of measure the distance  in the world.

1. Direct method

2. Indirect method

1. :-direct method-  there is aa direct measurement by a specific scale.it is a finite distance.it can be measure easily.

2. Indirect method- in this method the Pythagoras and parallax method is used to measure.

             Stellar parallax method

              (Parallax method)

Astronomers estimate the distance of star in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun. 

              Parallax method

Definition:-  Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

:Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. 

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Q  》how can find de distance                       between earth and stars? Or click here

ans 》Parallex method is used to measure distance between the earth and star. 

      Distance from sun to earth=1AU(austronic unit)

              1AU=1.5×(10)¹¹m 

               1AU=3×(10)¹¹m

                Angle (L)=arc/radius

                  Let radius=d

                     d=arc/angle

Let angle Q1 and Q2

              Total angle=Q1+Q2

                  d=2AU/(Q1+Q2) in radian

     d=3x(10)¹¹/(Q1+Q2)×1/60×1/60×π/180

              Let Q1=10sec,Q2=20sec

then        d=144×(10)14=14.4×(10)¹⁵

            d=2 light year(approx.)..answer

                                      (°:9.4×(10)¹⁵=1ligh year)

remember:60sec=1min,60min=1°,180°=pie 

remember:1mm=1/10 vernier clipers,1vc=screw gause