Re: Is this a sundial... continued

Tue, 04 Jul 2006 04:09:21 -0700

To have an idea of the deviation between the time on a 'pseudo-sundial' and a right sundial, this example for a 'pseudo-sundial'  directed to the south and situated in Roma:

if it is  adjusted to real suntime on  june 21 (solstitium) it will gain at march 21 and september 23 (equinox)
- when it indicates 1 o'clock or 11 o'clock: 17 minutes
- when it indicates 2 o'clock or 10 o'clock: 33 minutes
- when it indicates 3 o'clock or 9 o'clock: 49 minutes
- when it indicates 4 o'clock or 8 o'clock: 63 minutes


Willy LEENDERS
Hasselt Flanders (Belgium)

Op 4-jul-06, om 09:45 heeft [EMAIL PROTECTED] het volgende geschreven:


Yes, the radiating hour lines from the footpoint of vertical gnomon was the only simple method of the country people out of the great cityes. Here in Italy this sundials or "pseudo-sundials" are not rare on the houses of peasants. I think also in a great and modern society, if someone want a simple sundial without calculations, can track the hour lines on the wall with a vertical gnomon and seeing the way of the sun in the sky. It isn't a right way to do a sundial! But very much people used it.
Ciao, Nicola



---------- Initial Header -----------

From      : "Robert Terwilliger" [EMAIL PROTECTED]
To          : "fer de vries" [EMAIL PROTECTED], [EMAIL PROTECTED]
Cc          : "sundial" [email protected]
Date      : Mon, 3 Jul 2006 09:20:15 -0400
Subject : RE: Is this a sundial... continued







Fer and Nicola,

As we know, radiating hourlines are also found on ancient English "scratch
dials", but as Fer says one would not expect to find them on a modern dial.

See the dial "embedded in the wall of Saint Gregory's church, Kirkdale,
North Yorkshire" below:

Bob


















-----Original Message-----
From: fer de vries [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 03, 2006 3:40 AM
Cc: bobt; sundial
Subject: Re: Is this a sundial... continued

Nicola,

Thanks for your addition.
Your notes bring sense to a dial with lines radiating from
the footpoint of a perpendicular gnomon and they still exist in Italy.

On the other hand I didn't expect this in a more modern
society as New York.

Best, Fer.

Fer J. de Vries

De Zonnewijzerkring

Eindhoven, Netherlands
lat.  51:30 N      long.  5:30 E

----- Original Message -----
To: "ferdevries" <[EMAIL PROTECTED]>
Cc: "bobt" <[EMAIL PROTECTED]>; "sundial" <[email protected]>
Sent: Monday, July 03, 2006 9:29 AM
Subject: Re: Is this a sundial... continued



Dear Bob and Fer,

I have seen in Italy several sundials with the hour lines
radiated from
footpoint of the vertical gnomon. This are simple sundials
made from
simple people without gnomonic calculation, but only with the sun
observation. The precisione is not high, but good for
living in the little
country of XVIII-XIXth century.  I have seen several
sundials in this mode
on house and church in Italy. Also the italian diallists
point out this
dials like "pseudo-sundials", and not more time ago this was a long
diatribe on the italian mailing list on this subject. But
this simple
sundials are not very rare in Italy and its are the
testimoniance of
measuring time of our simple people in the country.
Thanks to all and sorry for my bad english

---------- Initial Header -----------

From      : [EMAIL PROTECTED]
To          : "Robert Terwilliger"
[EMAIL PROTECTED],"Sundial Mailing
Cc          :
Date      : Sat, 1 Jul 2006 20:09:51 +0200
Subject : Re: Is this a sundial... continued







Bob, Nicola,

I also saw the "hourlines" on  the sunny photograph of
this dial but they
didn't give sense to me.
They radiate from the footpoint of the perpendicular
gnomon on the wall,
I guess, and to my opinion they are not (usual) hourlines.

I don't know the text by Nicola and ask to place that text
on the sundial
list so we all can learn Nicola's thoughts.


Best, Fer.

Fer J. de Vries

De Zonnewijzerkring

Eindhoven, Netherlands
lat.  51:30 N      long.  5:30 E

  ----- Original Message -----
  From: Robert Terwilliger
  To: 'Sundial Mailing List'
  Sent: Saturday, July 01, 2006 6:17 PM
  Subject: Is this a sundial... continued


  Nicola and all,

  Nicola, I did not notice the hourlines until you pointed
them out.
Thank you, this dial is beginning to make more sense.

  I have put another page online with an edited version of
Nicola's
graphic with a statement and link about the dial's concept.


  Bob



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