Hi all in the past days I was in Châtillon (Aosta, Italy) at Seminario di Gnomonica, the italian convention.
I presented a document about the bifilar sundials. It doesn’t unveil new features but show how to make a bifilar sundial without formulas, only with ruler and compass. The geometrical construction allows to get equiangle lines, choosing the direction of the noon, on any oriented dial. It isn’t a classical written story but a sequence of rendering of 3D drawings with notes. It is packed in a pdf document of 5,43 MB and you can dowload it here: www.sundialatlas.eu/atlas.php?doc=14 The final geometrical constructions are at pages 22 and 23 but all the document has the purpose to show how a bifilar works instead to accept what the formulas says. Today I finished to translate it but my english is not so good and I found some difficults to translate the geometrical arguments. I’m sorry if there are any errors or language knots, any suggestion to improve the text is welcome. Luckily the images are universal :-) ciao Fabio PS who has a tablet may get the doc with this QR code Fabio Savian fabio.sav...@nonvedolora.it Paderno Dugnano, Milano, Italy 45° 34' 10'' N, 9° 10' 9'' E, GMT+1 (DST +2)
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