created by Carl Sabanski
North vs South
Hemisphere (northern and southern): one half of the Earth's globe, either north or south of the equator. Note that a sundial at a particular latitude in one hemisphere must be reversed for use at the reciprocal latitude in the other hemisphere.
The following figures illustrate identical sundials designed for 50° North and 50° South latitude. One is a mirror image of the other. Also note, by their colour, that the declination lines are reversed. The gnomon is orientated with the either the north or south celestial pole.
A vertical direct south sundial in the Northern hemisphere becomes a vertical direct north sundial in the Southern hemisphere. And when it is summer in one hemisphere it is winter in the other.
To position your horizontal sundial
correctly, you need to find true north or south. You can
use the techniques described on the page "Finding True