Question

what is meant by parallax and parallactic angle how can we find the distance of moon by parallax method

Answer 1

Explanation:

Determination of distance of moon from earth (by parallax method) Let the object O be viewed with our eyes which is at a distance of r, making an angle q between the two eyes as shown in the diagram. The angle q, caused by the two lines drawn from the position of the two eyes to the object, is called angle of parallax.

Answer 2

Explanation:

parallax is the name given to change in position of an object with respect to the background, when the object is seen from different position.

Parallactic angle is the angle made by the arc of length of 1 AU. You can find the distance by the formula

distance = $\frac{angle}{Radius of moon}$

To Calculate the distance of the moon by parallax method:

Let θ is the angular diameter of moon

d – is the distance of moon from earth, from figure,

θ = $\frac{D}{d}$

Diameter of moon D = d.θ  

by knowing θ, d, diameter of moon can be calculated