Question

Using Parallax method, explain the measurement of large distance.

Answer 1

Explanation:

1) Let the moon (or planet) be O viewed from point of observation which is at distance of r, making an angle θ

between the two point of observation.

2) The angel θ cause by the two line drawen from the position of the two point of observation to the object is called angle of parallax.

3) If we can consider OA and OB as radius of a circle and the distance x or AB as arc.

4)By knowing the values of x and θ,the distance of the object from the point of observation can be found out.

Answer 2

Answer:

To measure large distances, such as the distance of a planet or a star from Earth, astronomers use the principle of parallax. Here, the term parallax is the semi-angle of inclination between two sight-lines to the star, as observed when Earth is on opposite sides of the Sun in its orbit.