Just as there are two shadow casting elements (styles) of a thick gnomon so there are two noduses (nodi?) , one on each side of the gnomon. In other words you need to mark the nodus across the gnomon's width so that it operates on both sides. Then you read the point of the nodus in the ordinary way since the shadow on the dial is formed from one side or other of the gnomon. ---------- From: sundial-approval To: sundial Subject: Gnomon Thickness Issues Date: 11 July 1996 09:17
Quick ?: On a sundial with a split face (for a "significantly thick gnomon"), will a nodus cut into the style still function properly? Of course, the style length itself could be exactly where a nodus would fall, but for ease of construction, I'd imagine that it would be better to include a bit more style, past the nodus. How would one read the point on the face where the nodus is projected? Same as for the time itelf (ie., from the side of gnomon corresponding to the side of the dial face the gnomon shadow is projected) ? Thanks... john. ... re: the longitude correction "vote" ... the Local dial proponents win... Now, I just have to have a way to mount a handy weather proofed digital calculator under the dial somehow, so that the displayed sundial time can be manually inputed on the spot, and a calculation made so that the standard time will be displayed complete with long and EoT correction.... ;-)
