AW: New indoor sundial with lens/mirror

Niel <kepler...@gmail.com> Cc: Sundial sundiallist <sundial@uni-koeln.de> Betreff: Re: New indoor sundial with lens/mirror Hello Kurt, Fun video. I'm sure the construction was harder than it looks. Why are the indoor hour lines curved? How is this different from a gnomonic

Re: New indoor sundial with lens/mirror

Hello Kurt, Fun video. I'm sure the construction was harder than it looks. Why are the indoor hour lines curved? How is this different from a gnomonic projection, which has straight hour lines? -Bill On Sat, Apr 21, 2018 at 8:33 AM, Kurt Niel wrote: > Hi All, > > just

Re: New indoor sundial with lens/mirror

Hi All, just added two videos about final works: 1) about the indoor sundial: https://m.youtube.com/watch?v=WzyvEpsEL8A 2) about the outdoor sundial: https://m.youtube.com/watch?v=mdw9mLih6gE Kurt Am 20.04.2018 3:32 Nachm. schrieb "Kurt Niel" : Hi all, proudly presenting

Re: New indoor sundial with lens/mirror

Dear Bill, thank you for your ideas! This is not the final destination of my approach - there are several more or less intuitive design elements which I had to finaly put together. It took me many opponent ideas to fit into a single small bottleneck of realization. 1) Glas lens: I had to order a

Re: New indoor sundial with lens/mirror

Hello Kurt, Congratulations on completing a challenging project. I would like to ask a few optical questions. Why did you use a lens at all? In my experience, a lens differs from an open aperture in that it distorts the path of the sun. For example, straight lines, if they are off-axis, are

Re: New indoor sundial with lens/mirror

Spectacular! Techno-Modern-Gnomonics.  Almost a reverse display, instead of shadow, the point of light is the display.   Sort of a reflecting gnomon -rather than a shadow.   In my translated page it is called a shadow - but should there be a different term for a concentrated spot of light?

New indoor sundial with lens/mirror

Hi all, proudly presenting my latest sundial within a primary school here in Upper Austria: https://kepleruhr.at/su-vs-wallern and https://flic.kr/s/aHsm9EgPtL Bending mirror because of the narrow lightwell. Cheers Kurt https://kepleruhr.at ---