Hi Donald,
It looks good. Do you think it would look even better if the girl in the
northern hemisphere was looking towards north. And the girl in the southern
hemisphere was looking south.
You could also add a sun coming up in the east moving overhead between the two
girls and setting in the west.
I would also add the four points (N, E, S, W) of the compass to show the sun
rising in the East, setting in the West etc.
The only problem is that you would have to redraw one animation (sundial) so
that it faces into the page.
Regards,
Roderick Wall.
From: Donald Christensen
Sent: Tuesday, January 15, 2013 4:59 PM
To: robic.j...@wanadoo.fr
Cc: sundial@uni-koeln.de
Subject: Re: Analemmatic sundial
Joel
I have combined the two animations and made them into one. Feel free to copy it
for your site instead of having the two separate ones.
Cheers
Donald
0423 102 090
www.sundialsforlearning.com
On Mon, Jan 14, 2013 at 4:44 AM, Roger Bailey <rtbai...@telus.net> wrote:
--------------------------------------------------
From: "rPauli" <rpa...@speakeasy.org>
Sent: Sunday, January 13, 2013 12:00 AM
To: "Roger Bailey" <rtbai...@telus.net>
Cc: <h.sondereg...@utanet.at>; <sundial@uni-koeln.de>
Subject: Re: Analemmatic sundial
Isn't there an optimal sundial design for equator regions?
Hi Richard and all,
The Greeks solved this with the hemispherium and scafe dials. The
hemispherium is a spherical bowl with a point gnomon. The celestial sphere of
the sky above is projected through the point onto hour and declination lines
marked in the bowl. The curved bowl provides uniform scaling.
A point gnomon above a horizontal or polar plane works as well but when the
sun is low the shadow race off on a tangent. The scafe is a section of the
hemisphere, the relevant section based on the suns declination. Fer De Vries
has on his website design information for a hemisherium.
Copy and paste this url: http://www.dse.nl/~zonnewijzer/hemisph.htm
Even a horizontal sundial with a polar gnomon works in the tropics. Generally
just a section of the polar gnomon is used and this is raised and supported
above the plane.
Regards, Roger Bailey
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