RE: From Mexico with love...
Beautiful rooms and concepts, Ruben! A wonderful teaching facility. Your low latitude is certainly a help in fitting these dial displays to an interior. After viewing your pages, I once again looked at my living room with an eye towards a noon line, as I have a roof window well situated near the South wall, but due to its height (just over 10 feet) and my latitude (37.3°), the resulting analemma doesn't fit the living room at all. It's too far from the South wall in Summer, and extends well past the open floor space in Winter. However, it did get me to thinking again, and doing some calculations. If I designed the line for a more southern location, say 9° North, the total length of the analemma was much shorter, and the Summer end would extend South of the ceiling hole, quite close to my South wall. Moving my home 28° to the South isn't very practical, but it occurred to me that I could introduce a deviation in the incoming rays, and accomplish the same result! I thought of a prism, but the geometry isn't very good; finding the right prism (apex angle and refractive index) would be difficult and/or expensive, and I would have to deal with chromatic dispersion, as well. But a pair of mirrors, even first-surface mirrors, is much easier. If the first mirror (to the north of center) was blacked-out, with a small, pinhole reflective aperture, inclined vertically or slightly to the North, its reflected beam could fall on the second, larger, flat a few inches to the south, inclined 14° more to the north. The 14° apex angle of the pair would introduce a 28° deviation towards the south, independent of the exact inclination of the pair. (They would have to be accurately aligned East-West, of course.) Any inaccuracies in mirror angles and orientation would be hard to allow for in plotting the Noon analemma, but I could always fall back on the ancient empirical method of driving a tack at 12:00 local solar time, once a week! Something a little like the ASCII sketch below. Assume the light enters from above and to the right... | |\ | \ \ \ Dave -Original Message- On Behalf Of ruben nohuitol Hi friends, please look my cosmic room, my page is www.ruben.mx --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: From Mexico with love... Should we use a different title in the subject line?????
Hi all, Would it be better if a different title in the subject line is used. I almost deleted the your email without reading it. Others may have deleted it without reading it. Roderick. -Original Message- From: Dave Bell Sent: Monday, February 13, 2012 12:42 PM To: sundial@uni-koeln.de Subject: RE: From Mexico with love... Beautiful rooms and concepts, Ruben! A wonderful teaching facility. Your low latitude is certainly a help in fitting these dial displays to an interior. After viewing your pages, I once again looked at my living room with an eye towards a noon line, as I have a roof window well situated near the South wall, but due to its height (just over 10 feet) and my latitude (37.3°), the resulting analemma doesn't fit the living room at all. It's too far from the South wall in Summer, and extends well past the open floor space in Winter. However, it did get me to thinking again, and doing some calculations. If I designed the line for a more southern location, say 9° North, the total length of the analemma was much shorter, and the Summer end would extend South of the ceiling hole, quite close to my South wall. Moving my home 28° to the South isn't very practical, but it occurred to me that I could introduce a deviation in the incoming rays, and accomplish the same result! I thought of a prism, but the geometry isn't very good; finding the right prism (apex angle and refractive index) would be difficult and/or expensive, and I would have to deal with chromatic dispersion, as well. But a pair of mirrors, even first-surface mirrors, is much easier. If the first mirror (to the north of center) was blacked-out, with a small, pinhole reflective aperture, inclined vertically or slightly to the North, its reflected beam could fall on the second, larger, flat a few inches to the south, inclined 14° more to the north. The 14° apex angle of the pair would introduce a 28° deviation towards the south, independent of the exact inclination of the pair. (They would have to be accurately aligned East-West, of course.) Any inaccuracies in mirror angles and orientation would be hard to allow for in plotting the Noon analemma, but I could always fall back on the ancient empirical method of driving a tack at 12:00 local solar time, once a week! Something a little like the ASCII sketch below. Assume the light enters from above and to the right... | |\ | \ \ \ Dave -Original Message- On Behalf Of ruben nohuitol Hi friends, please look my cosmic room, my page is www.ruben.mx --- https://lists.uni-koeln.de/mailman/listinfo/sundial - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2112/4806 - Release Date: 02/12/12 - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2112/4806 - Release Date: 02/12/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: From Mexico with love... Should we use a different title in the subject line?????
R Wall ML emails wrote: Hi all, Would it be better if a different title in the subject line is used. I almost deleted the your email without reading it. Others may have deleted it without reading it. +1 Please use descriptive non-generic subject lines. I get 2000+ spam emails/day; most (99+%) get caught but enough still get through that I'm pretty quick on the delete button. -- Honoring our vets. http://www.bataanmarch.com/ --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Negative sundial in Mexico, Cuarto Cosmico
Hi friends, please look my cosmic room, we are acually buildind other two identicals to conect them by web cams in a page where people can see the diferences between latitud and longitud places, nobody will be more happy than me if you get the idea and make somo other cosmic room in your place, there are in my page free blueprints in autocad and sketchup..., also have in my page another cosmic novels, please enjoy my page is www.ruben.mx Thank you, Ruben Nohuitol Queretaro, Mexico www.ruben.mx--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: From Mexico with love...
These days it is wise to wait before clicking on an unknown link. Yes, we may miss some gems but let's wait until Mikey tastes it. If Mikey likes it then indulge. Thanks Mikey or whoever for confirming this link. Thanks Ruben for the link. It is good to see fresh information on this list. Regards, Roger Bailey ps. Mikey likes it was a major TV commercial on a breakfast cereal in the US. Even I know Mikey lives. -- From: ruben nohuitol nohui...@hotmail.com Sent: Saturday, February 11, 2012 11:28 AM To: sundial@uni-koeln.de Subject: From Mexico with love... Hi friends, please look my cosmic room, we are acually buildind other two identicals to conect them by web cams in a page where people can see the diferences between latitud and longitud places, nobody will be more happy than me if you get the idea and make somo other cosmic room in your place, there are in my page free blueprints in autocad and sketchup..., also have in my page another cosmic novels, please enjoy my page is www.ruben.mx Thank you, Ruben Nohuitol Queretaro, Mexico www.ruben.mx --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
