steve.lelievre.can...@gmail.com
To: sundial@uni-koeln.de sundial@uni-koeln.de
Sent: Sunday, 1 June 2014, 23:13
Subject: Request for information about a type of altitude dial
Hi folks,
http://www.pinterest.com/pin/301178293801331061/
What type of dial is this; I realize it's a form of altitude
%2BBEMo7BAxbEQqOqpMk6uxYnCJsB4uxugzo%3D%0Am=izSTWMgNnFv8DfKU%2Bd249F%2B%2FyJSDHvIkXOyVUqkC8%2FU%3D%0As=7631973f481f1363e8d75a48591133eaed99295b1faf9d05a8f4a1ea4c25175d
What type of dial is this; I realize it's a form of altitude dial, but is there
a specific name for it?
The accompanying note states that the dial can
Hi folks,
http://www.pinterest.com/pin/301178293801331061/
What type of dial is this; I realize it's a form of altitude dial, but
is there a specific name for it?
The accompanying note states that the dial can be adjusted for latitude
by moving the attachment point. I don't understand which
...@gmail.com
wrote:
Hi folks,
http://www.pinterest.com/pin/301178293801331061/
What type of dial is this; I realize it's a form of altitude dial, but is
there a specific name for it?
The accompanying note states that the dial can be adjusted for latitude by
moving the attachment point. I
steve.lelievre.can...@gmail.com
wrote:
Hi folks,
http://www.pinterest.com/pin/301178293801331061/
What type of dial is this; I realize it's a form of altitude dial, but is there
a specific name for it?
The accompanying note states that the dial can be adjusted for latitude by moving
the attachment
The benefit of an altitude dial is that it does need to be aligned with the
polar axis. With that concept in mind then a latitude adjusted altitude dial is
not feasible.
However, if one gives up that benefit, and takes an altitude dial and then
tilting it towards the pole, or away from
*
The benefit of an altitude dial is that it does need to be aligned with the
polar axis. With that concept in mind then a latitude adjusted altitude dial is
not feasible.
However, if one gives up that benefit, and takes an altitude dial and then
tilting it towards the pole
That is a very impressive both mathematically, and as an original
dial.
-Bill
On 1/25/2011 12:01 PM, Fabio Savian wrote:
hi Frank,
two years ago I designed a variant of the shepherd's dial so it
became universal (for any latitude).
Greetings, fellow dialists,
Thanks, all, for the communications. I think I did not make it clear
that I was thinking of a horizontal altitude dial, not a vertical one.
It would look a bit like an analemmatic dial laid out on the ground. I
understand how a shepherd's dial works and also how
Frank,
I made a horizontal altitude dial for the inside of a box. The date lines
are parallel to 2 edges, one of the other 2 edges is the shadow casting
object. The box has to be rotated to the sun so that the vertical edges
parallel to the date lines point to the direction of sun (cast
To: Sundial sund...@rrz.uni-koeln.de
Subject: re altitude dial
Message-ID: 4d4001bb.1070...@zooplankton.co.uk
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Greetings, fellow dialists,
Thanks, all, for the communications. I think I did not make it clear
that I was thinking
while the single
ellipse of an analemmatic dial is achieved through the movement of the
gnomon north-south through the year.
Almost every possible form of dial seems to have been devised already
but I have not come across an altitude dial resembling an analemmatic
dial in that the gnomon
not come across an altitude dial resembling an analemmatic dial in that the gnomon is moved with the seasons and the time curve is a single ellipse. The shepherd's dial is an altitude dial but with a gnomon fixed in place and more resembles the form of the double horizontal dial. Does an altitude dial
hi Frank,
two years ago I designed a variant of the shepherd's dial so it became
universal (for any latitude).
The moving gnomon is curved (the curve is an astroid) and it may move up and
down and also around the dial.
The gnomon (the tail of the rooster, the crest and the beak are decorative)
In message 4d3ef531.1090...@zooplankton.co.uk
Frank Evans frankev...@zooplankton.co.uk wrote:
Almost every possible form of dial seems to have been devised already
but I have not come across an altitude dial resembling an analemmatic
dial in that the gnomon is moved
Dear Frank,
You say:
I have not come across an altitude dial
resembling an analemmatic dial in that the
gnomon is moved with the seasons and the
time curve is a single ellipse.
One interpretation of what you seek is to
have a dial on a vertical wall where the
gnomon is horizontal
A: Sundialsund...@rrz.uni-koeln.de
Ogg: altitude dial
Greetings, fellow dialists,
I seek enlightenment. I understand that both analemmatic dials and the
secondary dials of double horizontals are azimuth dials and both are
based on the stereographic projection . The time curves on the double
horizontal dial
Hello Frank,
all altitude sundials use only the Sun’s altitude.
Since the altitude is measured on a vertical circle movable with the
Sun, a sundial that bases its action on it has to be movable or to have
some movable part around the vertical axis: in general the whole sundial
can rotate
Dear Gian Casalengo,
Thank you for your interesting example...
...you can use Orologi Solari to design
an analemmatic vertical dial like the one
you describe.
I am glad we get the same answer!
Gianni Ferrari is quite right...
... Analemmatic are never altitude sundials,
even if they are
of Sundial - Horizontal Altitude Dial. It
uses the altitude (height) of the Sun to indicate the time.
There is a possibility to chose to include or exclude the corrections
for the Equation Of Time and for the Longitude (with respect to the
Central Meridian of the Time Zone). Excluding both gives the Local
20 matches
Mail list logo
