Hello all,
A friend of mine wants a reflected ceiling sundial
and asked me to build it. We've been discussing how large the
reflected spot of sunlight should be so that it both artisticly pleasing,
easily visible and precise. A large spot is easily visible but lacks
precision. A small sp
Well, my guess about the diagonal line is that the wall declines to the south
east, and that the diagonal line defines the shadow path of the style's tip
on the equinoxes. I ain't got no idea what the numbers are all about. Bill
Gottesman, Burlington, VT
In a message dated 8/13/2001 7:46:08
Hi Dialists,
Can anybody in the Philadelphia area help this lady?
Hi Bob -
I work for the Pennsylvania Horticultural Society and we have a
community project where we are hoping to create an analemmatic dial. We
would like the child's shadow to show the time. Could you be of any
assistance in h
At a first guess, an answer to the second question may explain the first:
I would guess the diagonal lines (the 19 hour appears to be on a line
parallel to the one running right through the dial) are hour lines for a
different gnomon, perhaps roofline, corner, etc.
Dave
On Mon, 13 Aug 2001, Stev
Hi,
A friend has sent me a couple of pictures of a sundial at Montegufoni in
Tuscany, and has asked me how it works. I can't figure it out fully.
On the face of it, we seem to have a fairly ordinary vertical decliner using
a nodus, but we don't understand the hour numbering. They don't seem to b
At 10:48 AM 8/12/01 EDT, Bill Gottesman wrote:
>Hello All,
>I know Fred must be right about the declination being non-zero at the
>equinoxes, but I can't figure out why. As I understand, solar celestial
>right ascension must equal solar ecliptic longitude (Lambda) on the equinoxes
>(0 degrees
Hello All,
the differences that sometimes we may found on the instants of the Solstices
and the Equinoxes depend, in my opinion, on the fact that the Mean
Geocentric Longitude and the Apparent Geocentric
Longitude of the Sun. are often confused among them or considered
equal
The Apparent Ge
