1. What is the difference between the umbra and the penumbra of a shadow? 2. What is a penumbral eclipse of the Moon? Why is it easy to overlook such an eclipse? 3. Which type of eclipse—lunar or...

1. What is the difference between the umbra and the penumbra of a shadow?

2. What is a penumbral eclipse of the Moon? Why is it easy to overlook such an eclipse?

3. Which type of eclipse—lunar or solar—have most people seen? Why?

4. How is an annular eclipse of the Sun different from a total eclipse of the Sun? What causes this difference?