Fabio Quite brilliant ! That is a tour-de-force in programming. Best Kevin Kevin Karney, MA JP Freedom Cottage, Llandogo, Monmouth NP25 4TP. Phone 01594 530 595 Mobile 07595 024 960
> On 19 Jun 2015, at 22:44, Fabio nonvedolora <[email protected]> > wrote: > > Hi all > > I’ve just finished a new paper sundial, it is available as app 41, > www.sundialatlas.eu/atlas.php?app=41 > <http://www.sundialatlas.eu/atlas.php?app=41> > > It is like an hemi-sphere but realized with an half truncated icosahedron. > To simulate the sphere I used this archimedean solid, also known as > fullerene, with 32 faces: 12 pentagons and 20 hexagons. > It is also rendered with the image of the Earth (image credit of NASA – > Goddard Space Flight Center) > > Setted any coordinates, the app turns the solid so that the correspondent > point becomes the lower point, on the vertical axis trough the center of the > solid, then it dissects the solid with an horizontal plane to get the pseudo > hemisphere. > The app returns a pdf of 3 pages. The 1st with the section, the 2nd with the > development of the half solid and the 3th with the basement and the gnomon. > > The edge of the gnomon reaches the center of the solid and shows the time in > the concave pseudo hemi-sphere where there are also drawn the hour lines. > The edge of the shadow shows the time but also the point on the Earth where, > moment by moment, the Sun is at zenith. > > The algorithm is quite complex, the time to get the pdf may be about 18 > seconds (server time) for half analemma every hour to about 72 seconds for > the whole analemma every 5 minutes (not very useful). A common case of half > analemma every 10 minutes require about 30 seconds. > > Important note: the browsers have embedded a pdf reader to show these files > but they are not very accurate. May be you see lines slightly out of position > or you don’t get printed the dotted lines. The solution is very simple, save > the pdf in your computer, then open the file with Acrobat Reader, it is fully > able to show and print the whole content. > > On the top face you can also read the amplitude and the daylight arc. > > I verified the app with many locations, everything seems ok but your reports > will be welcome. > > Enjoy the summer solstice on app 41, ciao Fabio > > <hemi-truncated-icosahedron[1].jpg> > > Fabio Savian > [email protected] > www.nonvedolora.eu > Paderno Dugnano, Milano, Italy > 45° 34' 10'' N, 9° 10' 9'' E, GMT+1 (DST +2) > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial >
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