The hour markers on an analammatic dial are not lines from the centre of the ellipse they are positions along the periphery of the ellipse and are associated with the point of the shadow arising from the top of the vertical gnomon. So I'm afraid you_will_need to specify the height of the person. However, in my experience the observational accuracy of such dials is such that you can have quite a wide variation in height before significant errors are noticed!
Patrick Powers ---------- From: sundial-approval To: sundial Subject: RE: sundials (fwd) Date: 16 May 1996 23:45 > My Sundials program can do this. Just let me know the height of the person, > your latitude, and your longitude, and I can generate a scale model of the dial. >That's the problem - you need to know the height of the person. But I >could guess that the sundial should be used by people different tall. >- Daniel But if you use analemmatic sundial you do not need to know how much is the person high, because it's an azimutal dial. So if you do not want to move everytime the site of the gnomon you can use any azimutal dial you want. - Mario ====================== MARIO ARNALDI Viale Leonardo, 82 48020 Lido Adriano RA ITALY [EMAIL PROTECTED] ----------------------
