Northern sundials (both vertically mounted and horizontal versions) need to be pointed North, whereas Southern sundials need to be pointed South. The article is stating that Southern horizontal versions can be mounted vertically in the Nothern hemisphere but must be pointed South. I hope that helps, I had to re-read it a few times, myself.
How many people actually dropped Reddit for Lemmy?
It is possible to estimate?
How did people refer to clockwise movement before the invention of the clock?
Was there an alternative adjective to “clockwise” other than “the rotation you take around left hand”?...