Fer,
Only the first design drawings of the sundial are available.
The building is in construction and reaches on this moment the ground floor
level.
I can send on demand 3 drawings in jpeg-format (scanned of an Excell worksheet
graphic).
Drawing 1: the sundial for a vertical wall
Drawing 2: the sundial for the cylindric wall, projection on a vertical plane
Drawing 3: the sundial for the cylindric wall, unrolled in a plane
Drawing 3 includes the coordinates for the intersections of the hour lines and
the date lines (zodiac sign periodes) for use at the construction.
The architects choose for hourlines corresponding solar time with correction to
standard time only for the longitude and date lines only for solstices and
equinoxes.
The drawings have the same scale and correspond to the 3 phases ('fase' in
Dutch) of the calculation.
Orientation of the wall: 20,233 degree west of south
Heigth of the sundial: between 15 m and 18 m.
Radius of the cylinder: 4630 mm
Arrow of the arc: 1363 mm
Latitude: 50,865 north
The sundial is a nodal sundial. The node is situated in the middle of the cord
of the arc.
Who checks the calculations?
Willy Leenders
Hasselt, Flanders, Belgium
"fer j. de vries" wrote:
> Willy,
>
> Show us a picture of that dial.
>
> Fer.
>
> Fer J. de Vries
> mailto:[EMAIL PROTECTED]
> http://www.iae.nl/users/ferdv/
> Eindhoven, Netherlands
> lat. 51:30 N long. 5:30 E
>
> ----- Original Message -----
> From: "Willy Leenders" <[EMAIL PROTECTED]>
> To: <[email protected]>
> Sent: Monday, July 22, 2002 6:40 PM
> Subject: Re: time scale labels
>
> > David,
> >
> > I calculated a week ago a sundial of 7 m x 4 m on a cilindric part of the
> façade
> > of a new building in Brussels at a heigth of 15 m. One has to stand at the
> other
> > side of the avenue to see the shadow of a ball indicating the hour on the
> > façade.
> >
> > Your 'simple' solution is here not suitable.
> >
> > Willy Leenders
> > Flanders, Belgium
> >
> > [EMAIL PROTECTED] wrote:
> >
> > > My feeling is that the simpler you make the dial, the more likely it is
> to be
> > > used/understood. So.....make a dial with only one scale of hours,
> arranged to
> > > show local time i.e. noon line vertical, and noon (preferably) or 1pm
> marked
> > > on that vertical line. then in the equation of time correction curve,
> allow
> > > for longitude in the scale of minutes correction (the curve is 'lifted'
> on
> > > the minutes axis by 4minutes for everey degree west of the time zone
> standard
> > > meridian, and lowered correspondinglyfor every degree east. Then put a
> short
> > > instruction clearly on the area of the correction curve that says (if in
> UK,
> > > for example, for a dial that has 12 marked on the local noon line) GMT:
> apply
> > > minutes. BST: + 1 hr.
> > > David Brown, Somerton, Somerset, UK
> > > -
> >
> > -
> >
>
> -
-
