Re: Sundial inside a room, but room is inside a canyon!
I love it! If Tom can sell his neighbor on the esthetic upgrade to his house, it's a great solution. How does the geometry work out? Would the mirror need to be *very* high, say, over 2 stories itself? Closer, or farther than Tom's South wall? I guess the design trick would be to calculate a South-facing dial with a nodus 10 feet away from the face, and adjust the nodus hieght to fit... Dave 37.277N 121.966W On Sun, 4 Jan 2004, Thibaud Taudin-Chabot wrote: Tom, There is an other solution: Put a miiror high on your south facing wall which will reflect the sun on your neighboors North wall. Design a sundial for that North Facing wall of your neighboor. He will never look at it but you see it all the time. Thibaud At 07:36 04-01-2004, you wrote: I have a nice, south-facing room. The trouble is, my neighbor's two-story house is about 10 feet away, due south. Consequently, if I cut an aperture in my wall, the sun would find it only mid-summer. The rest of the time, my neighbor's roof would block the sun. Demolishing his second story is not an option, he says. Tom Egan 33.642 N, 117.943 W- -
Re: Sundial inside a room, but room is inside a canyon!
I sketched out a vertical dial, figuring a mirror as the nodus on a pin gnomon perpendicular to the dial face, using Fer J. de Vries' ZW2000 software. I used my northern California coordinates. It's a *little* large, for a suburban home. A mirror 10 feet from the plane of the wall seems to require a dial face on the order of 86 feet wide by 50 feet tall! If the small attachment comes through, it should explain it... Dave 37.277N 121.966W On Sun, 4 Jan 2004, Thibaud Taudin-Chabot wrote: Dave, Tom, It is not that difficult, mirror the neighbors wall in relation to the mirror, so it will be some imaginary wall in Tom's house. The mirror is the tip of the gnomon, or a little window whatever you like. The south facing dial on the mirrored neighbors wall has to be mirrored back: left and right should switched like top and bottom. And that is simply done by rotating the whole design around a horizontal perpendicular axis. Thibaud At 18:21 04-01-2004, you wrote: I love it! If Tom can sell his neighbor on the esthetic upgrade to his house, it's a great solution. How does the geometry work out? Would the mirror need to be *very* high, say, over 2 stories itself? Closer, or farther than Tom's South wall? I guess the design trick would be to calculate a South-facing dial with a nodus 10 feet away from the face, and adjust the nodus hieght to fit... Dave 37.277N 121.966W On Sun, 4 Jan 2004, Thibaud Taudin-Chabot wrote: Tom, There is an other solution: Put a miiror high on your south facing wall which will reflect the sun on your neighboors North wall. Design a sundial for that North Facing wall of your neighboor. He will never look at it but you see it all the time. Thibaud At 07:36 04-01-2004, you wrote: I have a nice, south-facing room. The trouble is, my neighbor's two-story house is about 10 feet away, due south. Consequently, if I cut an aperture in my wall, the sun would find it only mid-summer. The rest of the time, my neighbor's roof would block the sun. Demolishing his second story is not an option, he says. Tom Egan 33.642 N, 117.943 W- - - Thibaud Taudin-Chabot 52 18' 19.85 North, 04 51' 09.45 East, alt. -4.50 m home email: [EMAIL PROTECTED] - Content-Type: IMAGE/GIF; name=MirrorDial.GIF Content-ID: [EMAIL PROTECTED] Content-Description: Content-Disposition: attachment; filename=MirrorDial.GIF Attachment converted: Macintosh HD:MirrorDial.GIF (GIFf/JVWR) (000B088B)
dialling in Andalusia
Dear all, I am going to Granada, Cordoba and Seville in Andalusia, Spain very shortly and wondered whether somebody might be able to point out a few dials or astrolabes in the area. Thanks: Heiner 51N/1W -
Re: Sundial inside a room, but room is inside a canyon!
Hi Tom: Is a skylight hole in your roof possible? This would eliminate most of your problems with mirrors. You don't need a flat roof. A skylight hole could be used for any of the interior dials I mentioned. John L. Carmichael Jr.925 E. Foothills Dr.Tucson Arizona, USATel: 520-696-1709Email: [EMAIL PROTECTED]Sundial Sculptures Website: http://www.sundialsculptures.comStained Glass Sundials Website: http://advanceassociates.com/Sundials/Stained_Glass - Original Message - From: Tom Egan To: sundial@rrz.uni-koeln.de Sent: Saturday, January 03, 2004 11:36 PM Subject: Sundial inside a room, but room is inside a canyon! I have a nice, south-facing room. The trouble is, my neighbor's two-story house is about 10 feet away, due south. Consequently, if I cut an aperture in my wall, the sun would find it only mid-summer. The rest of the time, my neighbor's roof would block the sun. Demolishing his second story is not an option, he says.I thought of using mirrors to relay the sun's rays down the canyon between our houses, much as a periscope would. This could be an extension of John Carmichael's reflection sundial (#4 in his reply to Ronit) Several problems with that, since the horizon-to -horizon and season-to-season arc of the sun would require either A small mirror on top and a huge mirror at the bottom end, plus a huge aperture, or A large set of individually aligned small mirrors on top that are focused on a small mirror at bottom. Then I thought of a bundle of optical fibers to carry the sun position information down to a dial or display inside the room. This might be considered an extension of John's #3 projection dial. A little better, but still requiring precise aligning of hundreds of individual fibers at the top end. Plus the disadvantage of losing some resolution and brightness because of quantizing the information (in discrete fibers) and then transmitting it through glass instead of air.Finally, I remembered Mike Shaw's clever implementation of an Indoor Dial he reported on October 29 (or thereabouts), 2000. He used a 150 mm diameter, plastic sewer pipe to hold the fibers in an equatorial semicircle. While he could have installed enough fibers to give 5-minute resolution, he chose to start with just 15-minute resolution. The display ends of the fibers were arranged around the periphery of a clock face. He reported that plenty of light gets down to the display.This isn't quite what I'm looking for, though, as I'd like the equivalent of a garden sundial in my room whose gnomon casts a shadow. I think I can now properly formulate my question: Is there a way to get the sun's rays down to my room so I can have them illuminate an ordinary sundial? (Without demolishing my neighbor's house or spending a ton of money?)Tom Egan33.642 N, 117.943 W-
Sundial inside a room, but room is inside a canyon!
Message text written by INTERNET:sundial@rrz.uni-koeln.de I think I can now properly formulate my question: Is there a way to get the sun's rays down to my room so I can have them illuminate an ordinary sundial? (Without demolishing my neighbor's house or spending a ton of money?) Not perhaps quite what you want but you might consider optical fibres. David Young used these to design a Remote Reading Sundial (see his article in BSS Bull 12(i) pp20-22.) Patrick -
The Mars sundial
Title: Message Spirit had landed, and the first extraterrestrial sundial is on the surface of Mars. See the NASS Links page: http://sundials.org/links/ Bob Terwilliger NASS Webmaster
RE: dialling in Andalusia
Hello Heiner, Go to http://inicia.es/de/RELOJANDALUSI/ This is a great website on sundials in Andalusia. Roger Bailey Walking Shadow Designs N 48.6 W 123.4 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of heiner thiessen Sent: January 4, 2004 9:34 AM To: sundial@rrz.uni-koeln.de Subject: dialling in Andalusia Dear all, I am going to Granada, Cordoba and Seville in Andalusia, Spain very shortly and wondered whether somebody might be able to point out a few dials or astrolabes in the area. Thanks: Heiner 51N/1W - -
Re: Sundial inside a room, but room is inside a canyon!
There is an other solution: Put a miiror high on your south facing wall which will reflect the sun on your neighboors North wall. Design a sundial for that North Facing wall of your neighboor. He will never look at it but you see it all the time. Thibaud At 07:36 04-01-2004, you wrote: I have a nice, south-facing room. The trouble is, my neighbor's two-story house is about 10 feet away, due south. Consequently, if I cut an aperture in my wall, the sun would find it only mid-summer. The rest of the time, my neighbor's roof would block the sun. Demolishing his second story is not an option, he says. Tom Egan 33.642 N, 117.943 W- - Thibaud Taudin-Chabot 52° 18' 19.85 North, 04° 51' 09.45 East, alt. -4.50 m home email: [EMAIL PROTECTED] -
Re: Sundial inside a room, but room is inside a canyon!
It is not that difficult, mirror the neighbors wall in relation to the mirror, so it will be some imaginary wall in Tom's house. The mirror is the tip of the gnomon, or a little window whatever you like. The south facing dial on the mirrored neighbors wall has to be mirrored back: left and right should switched like top and bottom. And that is simply done by rotating the whole design around a horizontal perpendicular axis. Thibaud At 18:21 04-01-2004, you wrote: I love it! If Tom can sell his neighbor on the esthetic upgrade to his house, it's a great solution. How does the geometry work out? Would the mirror need to be *very* high, say, over 2 stories itself? Closer, or farther than Tom's South wall? I guess the design trick would be to calculate a South-facing dial with a nodus 10 feet away from the face, and adjust the nodus hieght to fit... Dave 37.277N 121.966W On Sun, 4 Jan 2004, Thibaud Taudin-Chabot wrote: Tom, There is an other solution: Put a miiror high on your south facing wall which will reflect the sun on your neighboors North wall. Design a sundial for that North Facing wall of your neighboor. He will never look at it but you see it all the time. Thibaud At 07:36 04-01-2004, you wrote: I have a nice, south-facing room. The trouble is, my neighbor's two-story house is about 10 feet away, due south. Consequently, if I cut an aperture in my wall, the sun would find it only mid-summer. The rest of the time, my neighbor's roof would block the sun. Demolishing his second story is not an option, he says. Tom Egan 33.642 N, 117.943 W- - - Thibaud Taudin-Chabot 52° 18' 19.85 North, 04° 51' 09.45 East, alt. -4.50 m home email: [EMAIL PROTECTED] -
Sundial inside a room, but room is inside a canyon!
I have a nice, south-facing room.� The trouble is, my neighbor's two-story house is about 10 feet away, due south.� Consequently,� if I cut an aperture in my wall, the sun would find it only mid-summer.� The rest of the time, my neighbor's roof would block the sun.� Demolishing his second story is not an option, he says. I thought of using mirrors to relay the sun's rays down the canyon between our houses, much as a periscope would.� This could be an extension of John Carmichael's reflection sundial (#4 in his reply to Ronit)� Several problems with that, since the horizon-to -horizon and season-to-season arc of the sun would require either A small mirror on top and a huge mirror at the bottom end, plus a huge aperture, or A large set of individually aligned small mirrors on top that are focused on a small mirror at bottom. Then I thought of a bundle of optical fibers to carry the sun position information down to a dial or display inside the room.� This might be considered an extension of John's #3 projection dial.� A little better, but still requiring precise aligning of hundreds of individual fibers at the top end.� Plus the disadvantage of losing some resolution and brightness because of quantizing the information (in discrete fibers) and then transmitting it through glass instead of air. Finally, I remembered Mike Shaw's clever implementation of an Indoor Dial he reported on October 29 (or thereabouts), 2000.� He used a 150 mm diameter, plastic sewer pipe to hold the fibers in an equatorial semicircle.� While he could have installed enough fibers to give 5-minute resolution, he chose to start with just 15-minute resolution.� The display ends of the fibers were arranged around the periphery of a clock face.� He reported that plenty of light gets down to the display. This isn't quite what I'm looking for, though, as I'd like the equivalent of a garden sundial in my room whose gnomon casts a shadow. I think I can now properly formulate my question:� Is there a way to get the sun's rays down to my room so I can have them illuminate an ordinary sundial?� (Without demolishing my neighbor's house or spending a ton of money?) Tom Egan 33.642 N, 117.943 W -
