Hello,

Hope you are doing well.

As per your question, if we consider solid angle as theta then it is normally defined as theta equals to diameter upon distance . So it would be like 3.47 *10³ divide by 3.84*108 so this would give result as 9.0*10-.

So the solid angle subtended by the moon at any point of earth is 9.0 *10-.

So hope this information helps you out. Thank you.