[robobro]

I live on the equator...

North: hour to sun, bisect with 12 for south.

South: 12 to sun, bisect with hour for north.

Equator : mark the movement of shadows, I guess.

[possiblywrong]

Author of the linked article here; re marking movement of shadows, I wrote a follow-up that discusses some alternatives, mainly that one:

https://possiblywrong.wordpress.com/2014/07/05/using-a-watch...