Dear all, I need your opinions and advice on which could be the greatest *effective* size of an analemmatic sundial for average latitudes.
As you all know, for latitudes about 40 deg, the least longitude of the style equals more or less the major semiaxis of the ellipse so that the shadow can reach the ellipse on the worst case, this is, at summer solstice noon. However, in practice it could be too conservative to suppose so (who, except us, stands on an analemmatic in the worst of summer?), and perhaps there are some practical rules you know... Any hint? I am considering that the date scale can be on a 30 cm high step where the user gets up to and that the user can rise his/her hand so that the effective height of the style could be around 220 cm or so. Best regards, Anselmo -
