Question

Example 1.1: What is the solid angle subtended<br />by the moon at any point of the Earth, given<br />the diameter of the moon is 3474 km and its<br />distance from the Earth 3.84x10^8 mm.​

Answer 1

Let θ be the solid angle subtended by moon at any point on earth.

Given :

d = 3474 km

x = 384000000 m = 384000 km

We know that:

Angle of parallax is given by :

θ = d / x

θ = 3474 / 384000

θ = 0.009047 rad

θ = 0.5183°

Thus, the solid angle subtended by moon at any point on earth is 0.5183°.

Answer 2

ANSWER

64.249 x 10^-5

Explanation: