Hello Peter: You are the first person who says they have seen a sundial similar to the one I have proposed. I assume you mean the separation of the nodus off of the style by placing it instead on the top of a vertical nodus located at the dial center? Thank you for the Scientific American info, will look up article next trip to library. As an accuracy check I'd like to compare the printouts of several different programs.
Thanks again, John C >On June 30th John Carmichael wrote: >> >>I know how to calculate and draw the declination lines for a vertical nodus >>projecting onto a horizontal face. But nowhere can I find a formula for an >>analemma projected onto a horizontal plane. > >John, > Sorry for the delay in adding my thoughts to those you've already >received, but I'm buried under piles of essays which must be marked... > Scientific American published an article plus a programme in BASIC >for such a sundial. The reference is the Amateur Scientist column for >December, 1980 pp. 174-180. The dial described was made by C.K. Sloan. I >have a pencilled note which adds that a correction was published in the >May, 1981 issue. > No doubt you may prefer to use ZONWVLAK, but if it would be of use, >I think I once keyed in the programme (it's very short, conventional BASIC: >a little cryptic...) and could try to find it if it would be of use. > > cheers, > > Peter > >---------------------------------------------------------------------- >Peter Mayer | [EMAIL PROTECTED] >Politics Department | >University of Adelaide | 'phone:+61.8 8303 5606/5610 >Adelaide, SA 5005 | FAX: (+61.8) 8303 3446 >AUSTRALIA | >---------------------------------------------------------------------- > > >
