Sundials on Pluto

How would a sundial work if we set one up on Pluto?

it sounds a whimsical question but it isn’t, because answering the question requires really understanding the bits of celestial mechanics we usually take for granted without thinking about them.

There is too much uncritical memorising in science today, and not enough thought. This two-part article is the antidote. It has beautiful pictures as well. (Part I, Part II).