Aristotle also thought that the earth was smaller than the other planets; a claim that was challenged by Eratosthenes, who used the shadows of sundials in Alexandria and Syene to calculate the circumference of the earth.
And they kinda are, actually, but here's the most important thing you need to understand about clocks, except for sundials and hourglasses, every single clock does the same thing.
" This is the envelope, " he continued. " The postmark is London — eastern division. Within are the very words which were upon my father's last message: 'K. K. K.'; and then 'Put the papers on the sundial.' "