Sixth Form Question: How big is the Moon's orbit

1. Make measurements on yourself to show that an outstretched finger subtends roughly 1 degree (ie the angle for an isosceles triangle staring at the left end of your outstretched little finger, coming in to a point at your eye and going back out to the right hand aide of your little finger).
2. The Moon is shown in the picture along with my little finger. Compare the two and use it to work out the angle subtended by the Moon.
3. The diameter of the Moon is given as 3474km. Use this and your answer to Q2 to work out the radius of orbit of the Moon around the Earth.
4. Find the true value for the radius of orbit of the Moon and calculate the percentage difference in your answer.
5. State and explain one false assumption that we have made.