Question

parallax method for mearsurment of large distance

Answer 1

Parallax and Stellar Parallax. Astronomers use an effect calledparallax to measure distances to nearby stars. Parallax is the apparent displacement of an object because of a change in the observer's point of view. ... The distance d is measured in parsecs and the parallax angle p ismeasured in arcseconds.

Answer 2

Consider a planet or star at a far away point p from 2 different positions on the earth, ie ,A and B. Let the distance of the star from the earth be D and let β be the angle between the 2 directions viewed from A and B .This angle is called parallax angle and is calculated ,
D=B/β