The Moon's angular diameter in our sky as observed from Earth is measured to be 0.5°. From this, we can find the diameter of the Moon in kilometers if we also know the Moon's
A)distance from the Earth.
B)element composition
C)distance from the Sun.

Question

Quizplus · Accepted Answer

We can use the formula for angular diameter:

angular diameter = (diameter of object / distance to object) * (180/π)

Solving for the diameter of the Moon:

diameter of Moon = (angular diameter * distance to Moon * π) / 180

Therefore, we need to know the distance from the Earth to the Moon to calculate its diameter.

The Moon's Angular Diameter in Our Sky as Observed from Earth