Читать книгу How to predict the weather with a cup of coffee: And other techniques for surviving the 9–5 jungle - Matthew Cole - Страница 45

In the morning, fix the mirror to the window sill (or a sash halfway up) so that it reflects a spot of light onto the ceiling. Position the mirror horizontally, as high (close to the ceiling) as you can get it.^* Now follow the progress of the spot and mark its position every hour with a pencil.

Well done, you now have your very own spot dial, or at least the makings of one. The dial part (the equivalent of the clock face) takes a bit longer.