Above is an analemmatic sundial. The idea is to orient the sundial facing south, and then place a vertical pointer on the central figure-8 track, in a position corresponding to the date. The sundial above shows a simulated shadow for 2:15 PM yesterday. It can be seen that the sundial tells the time reasonably well, thanks to the inbuilt adjustment for variation in solar position.
For large-scale analemmatic sundials, like the one below, people can stand on the central figure-8 track and act as a human pointer. A sundial like this is fun to have in the garden.
Here are blank sundials for some Southern Hemisphere cities:
- Adelaide, Australia
- Brisbane, Australia
- Canberra, Australia
- Melbourne, Australia
- Sydney, Australia
- Johannesburg, South Africa
The ShadowsPro software will also generate sundials like these, if anyone is particularly enthusiastic.
Scientific Gems 
