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: <sundial@rrz.uni-koeln.de> 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 > > - > > - > -
