# Parallax method

### Problem

Your friend calls you up to tell you about this amazing well he just dug. He has designed it so that at noon on this specific day, the sun will be passing directly overhead.
You just happen to be visiting another well which is 838, space, k, m away. Using the shadow cast by the well, you measure that the angle of the sun at this moment is currently 7, point, 536 degrees.
Using this information, what is the circumference of the Earth?
space, k, m