| Projects
for 2007 - Group H |
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"A sundial measures time by the position of the sun. The most
commonly seen designs, such as the 'ordinary' or standard garden sundial,
cast a shadow on a flat surface marked with the hours of the day. As
the position of the sun changes, the time indicated by the shadow changes.
However, sundials can be designed for any surface where a fixed object
casts a predictable shadow.
Most sundial designs indicate apparent solar
time. Minor design variations can measure standard and daylight saving
time, as well."
Wikipedia |
| Horisontal sundial in private garden in Pretoria. |
As a group
you will design a horisontal sundial for Sci-Enza.
Underneath
the horisontal plate with the hour lines you shall position
a globe so that Pretoria is at the top. This shall enable visitors
to see where on Earth it is day and where it is night.
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| Photo: Helga Nordhoff |
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| Sundial at UP - 1989 |
If time allows,
you shall investigate the sundial on the big lawn in front of Steers.
The little bird and the gnomon of the dial have been stolen.
You
shall find a suitable replacement for the gnomon and investigate
mathematically if it is possible for that dial to show the correct
time.
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| Sundial at UP - 1995 |
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Notice that the angle of the gnomon differs
in the two photographs. |
| Photos: UP archive |
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| (This page is still
under construction.) |
Resources
There must be millions of pages about sundials on the Web; a google search
found about 2,420,000 pages with the term "sundial". Below are some
useful links,
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Participants
- Jaco Janse van Rensburg (Mentor)
- Nomsa Jiyane
- Antoinette Moos
- Kevin Mootane
- Kavani Sanasi
- Ms Helga Nordhoff (Project leader)
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