http://home.iae.nl/users/ferdv/shadow1.htm
My understanding is that the ground doesn't have to be level, and can even be varying, which is a plus. Also, it is an interactive dial, and instructional.
Many thanks to Mac Oglesby for telling me about shadow planes. My own understanding of sundials
Thanks,
AlbertMac Oglesby [EMAIL PROTECTED] wrote:
Hello Albert, et alAlas, a dial such as the one you refer to won't work at all well at such a low latitude. Spend a moment or two with your favorite sundial program and you'll see why.Best wishes,Mac OglesbyI assume there is a building or pole,
Hi Douglas and all,
I can think of a couple of approaches off hand.
A multiple ridge dial with each ridge only an inch or so high, the 11
and 1 o'clock shadows determining where the next ridge would go,
the 10 and 2 o'clock the next, etc. All the ridges pointing north and
south of course.
Hi Douglas all,
It doesn't obey the initial conditions, but maybe a play-object is allowed
in a playground. How about a horizontal bar, on which children may turn
somersaults etc.? It can double as a sundial: let the bar just tilt 2 deg (3
cm at 1.70 m length), North end upward. Hour lines are
Hello Albert, et al
Alas, a dial such as the one you refer to won't work at all well at
such a low latitude. Spend a moment or two with your favorite sundial
program and you'll see why.
Best wishes,
Mac Oglesby
I assume there is a building or pole, or some such feature somewhere
Message text written by INTERNET:sundial@rrz.uni-koeln.de
Can any of our Mailing-List experts suggest some horizontal sundial design
suitable for locations almost on the Equator, (actually 2 Degrees North) ?
Hi Douglas. Not quite what you wanted (because it's not horizontal) but
faced with these
