3 ms·
The diameter of the path of totality is only about 100 miles, because it's only the umbra of the shadow. This is 20x smaller than the moon diameter. But, a 1km
by Dave_Rosenthal 9y ago
The diameter of the path of totality is only about 100 miles, because it's only the umbra of the shadow. This is 20x smaller than the moon diameter. But, a 1km moon bump is a 1km bump on the umbra as well, magnifying it's effect by the mentioned 20x and leading to a much different appearance.
- deleted 9y ago[deleted]
- jessriedel 9y agoI hadn't thought about this effect! You're absolutely right. Thanks very much. (For others:) A diagram of the umbra makes this clear: https://c.tadst.com/gfx/750x500/total-solar-eclipse-com.png?1 https://c.tadst.com/gfx/750x500/total-solar-eclipse-com.png?... If you draw a few triangles, you can get an analytic expression.