Question

what is parallax method

Answer 1

parallax is the apparent shift in position of an object when observed from two different positions . and the angle formed at the object from two positions is known as angle of parallax after measuring angle of parallax distance of object is measured by the formula
angle of parallax = arc length/ radius of object

Answer 2

Parallax is a method of measuring the distance to nearby objects in space. 

We have the formula also:-

angle of parallax =     Arc length     
                             Radius of object