Re: Some useful resource material
Andrew, In the article at: http://plus.maths.org/issue53/features/mee/index.html it states: <> But this is only true if you live on the standard meridian appropriate to your time zone. It's only 2 (different) days where I live at 3º West, and none at all if you live more than 16 minutes (4º) away. I have seen several sundials set incorrectly because of this misconception. Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Some useful resource material
Frank, Quite right, of course, though I was commenting on "you can relax after your Christmas dinner in the knowledge that your new watch will be telling the same time as your sundial." As ever, a pleasure to read your comments. Best wishes, Mike--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: A missing sundial Sundial Digest
<> A curious assertion :-) Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Tony Moss off line
Tony Moss has asked me to let you all know that his computer is not working at the moment. As a result, he can neither send nor receive emails. He apogogises for any inconvenience this may cause to list members. No doubt he will let us know us when he is back on line again. Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Glass on Glass Mosaic Indoor Sundial Windows
John Nobody has mentioned double glazing yet. I assume that you don't bother with that in Arizona. Will the magnets still be OK to use through two thicknesses of glass with an air space between? Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: 360 degree/Fabian
<> I guess that, if you are an astronomer, you don't want the date changing half way through your viewing session. Mike Shaw 53.37N 3.02W www.wiz.to/sundials PS By the way, we seem to have gone away from our previous convention of adding our latitude and longitude in our signatures. It is sometimes helpful to know where in the world a contributor is located. --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: upside down world
Perhaps if the cradles of civilisation had been in the southern hemisphere, our clocks would all go round the other way. Incidentally, I am surprised by how many television adverts in the UK show the sun rising or setting the wrong way. Do you suppose a lot of the filming is done in Australia? Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: bad sundials
John Carmichael wrote: <> == Hi John and everyone. Yes, I'm still alive and watching the list with interest. You're right (as usual), but I think you are remembering a short presentation that I did at a sundial society conference (NASS I think) some time ago. I give quite a lot of talks about sundials, and I often finish with a short section illustrating "what to look for when buying an 'off-the-shelf' sundial". Bear in mind that these talks are for the uninitiated. Things to look for are: a) Is the gnomon perpendicular to the dial face and pointing in the right direction? b) Are both shadow casting edges straight? c) Is the angle of the gnomon equal to your latitude? d) Is there a noon gap? e) Is the dial origin on a line joining the 6am to 6pm marks? f) Do the numbers go round the right way for your location? These points are illustrated, using one of Tony Moss' excellent horizontal dials, on my web page (see below), which, I'm afraid, is sadly in need of some maintenance - follow the link to "Buyer's Guide". That all said, I do have a collection of photos of about 15 or so "horribly wrong" dials which display all these errors which I will happily post, off-list, to anyone interested. I see that I have them in a folder entitled "Crap". These were all on sale to the public in garden centres, ebay etc.. BTW, do we still need the maximum attachment size restriction on the list? Mike Shaw 53'22"N 03'02"W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: AW: Year-round day saving time
If we ignore refraction effects, everywhere gets an average of 12 hours per day with the sun above the horizon, doesn’t it? So how can we get 17% more by changing the clocks. Want more time in the sun? Get up earlier! I’m losing a lot of my potential time in the sun today sitting indoors changing all my clocks. Mike Shaw 53'22"N 03'02"W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sundial house
Those of us who were fortunate enough to visit the home of Mark and Arabella Lennox-Boyd when we went on the BSS safari to Italy will remember how his house (Meridiana) was built as a sundial. Have a look at: http://www.bolkovonschweinichen.it/inglese/meridiana/index.html Mike Shaw 53'22"N 03'02"W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Are there any commercially-available 'Teaching Sundials', for schools ?
If I ever find a child who shows any interest in sundials, I give them a copy of "Sundials and Timedials" from Tarquin publications. See: http://www.tarquingroup.com/product.php?SKU_Code=438 Only £5.95 a copy and there are loads of paper dials to make of all different types. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: New Monumental Sundial in Oro Valley
Thanks to John for sharing and to Frank for asking those relevant questions. For those who weren’t at the recent conference and are not yet aware, it is perhaps worth mentioning that Frank King has just taken over as Chairman of the British Sundial Society from Chris Daniel. We are in safe hands. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: The Photographers Ephemeris software - maybe useful to dialists?
There’s a similar iPad App called LightTrac which isn’t as sophisticated. I see it is a “pay” one at the moment, but appears as freeware every now and then. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Multignomon Sundial
<> ... and you will need gnomons on both the upper and lower sides of the dial face if you want it to work all year. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: EoT diagram
I’m pretty sure there was one of these in an early version of Jane Walker’s “Make a Sundial” British Sundial Society publication. There is also one on the rear of Jim Morrison’s astrolabe. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sundial Beer Glass
Larry Bohlayr showed a similar design at the NASS Hartford conference a few years ago, see: http://sundials.org/attachments/article/91/1999_NASSConference_Hartford.pdf ... though his was in a straight sided glass which must make the calculations easier. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: mock stained glass sundial
If you are going to allow your shadow to pass through two panes of glass, will refraction start to become important? Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: mock stained glass sundial
I wrote: <> Fer replied: <> I suspected as much, but my maths is not good enough to do the calculations. I had an idea some time ago to use double glazing as a sundial. I made a model with two panes of glass mounted in a frame with the marker (two opposed triangles) and lines both on the INSIDES of both panes of glass. That one worked OK, but when I put the marker on the outside of the outer glass and the lines on the inside of the inner glass It didn’t work at all well. I put the problem down to: a) the two panes of glass were too close together and b) refraction shifted the shadow. BTW, I marked the glass with a spray can of Plasti-Kote 180 Glass Frosting Spray Paint. You could use this on the outside as it is weatherproof. I masked off the area and lines with Scotch magic tape cut very thinly with a craft knife and used Letraset as masks for the numbers. It worked very well. Photo available on request. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Falling Tree
If a married man says something in the middle of a forest where nobody can hear him – is he still wrong? Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: sundial Digest, Vol 72, Issue 11
<> Well, there's a controversial statement. Relative to what? The sun does move relative to me. I move relative to the sun. The sun moves relative to our galaxy. Our galaxy moves relative to ... etc.. The earth is moving at 67,000 mph relative to the sun. The sun (with the earth in tow) is travelling at 486,000 mph around the milky way The galaxies are moving away from each other at increasing speed the more distant they are. So it only really makes sense to talk about motion relative to something else. Is there such a thing as absolute motion? Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1873 / Virus Database: 2108/4677 - Release Date: 12/12/11 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Proceedings for Future of UTC meeting
Mac, <> You are correct. The Romans had no zero as it had not yet been invented, hence "the first hour", "on the third day", etc.. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1901 / Virus Database: 2109/4698 - Release Date: 12/23/11 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
No zero
Mac, <> Another thought. We use both "with zero" and "without zero" systems in our time measurement. I have a radio controlled digital clock and calendar on the wall. At the change of the year, it changes from: 23:59 - 31/12 to 00:00 (with zero system) - 1/1 (without zero system). And most of us don't notice. Merry Christmas! Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1901 / Virus Database: 2109/4698 - Release Date: 12/23/11 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sundial and the Leap Second
I spotted the photo yesterday. It looks remarkably like a Tony Moss dial plate, but not like a Tony Moss gnomon. No doubt he will tell us. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1901 / Virus Database: 2109/4754 - Release Date: 01/19/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: "Sundial" reference in Super Bowl commercial
Isn’t that a vertical direct south dial designed for use during Summer Time? Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2112/4792 - Release Date: 02/06/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Equinoctial vs. Equatorial
Tony’s explanation is also my understanding of the definitions – but then Tony and I do talk to each other quite a lot! Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2112/4809 - Release Date: 02/14/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Ante diem bis sextum Kalendas Martii
Just in case you are wondering why the 6th day before the 1st March isn't February 23rd. The Romans had no zero, so their counting system was different from the way we do it. Now Then Mar 1 = 0 1st Feb 28 = 1 2nd Feb 27 = 2 3rd Feb 26 = 3 4th Feb 25 = 4 5th Feb 24 = 5 6th Feb 23 = 6 Mike Shaw 53º 22'N 03º02'W - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2114/4828 - Release Date: 02/23/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Does anyone have contact details, for Brian Main ?
Linda, The installation of the analemmatic sundial was the initiative of the "Friends of Port Sunlight Village". I suspect Brian Main may be part of that group. It was designed by Douglas Hunt of "Modern Sunclocks". I understand, from the Port Sunlight Chief Executive (Lionel Bolland) that there are plans to add an explanatory plaque. I felt slightly aggrieved with him, as he turned down my local Rotary Club's plans to install a sundial at that very location for the millennium. The are two other sundials in Port Sunlight: A gnomonless vertical dial on the Dell bridge and A cross dial supported on the back of a sphinx in Bath Street which was erected to celebrate the Relief of Mafeking in 1899. (The current cross is a replacement that I delineated in 2000) This dial does have an explanatory plaque in place. Contact me if you want any further information about the dial, sundials in general or if you wish to know the whereabouts of other dials in the area. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.1913 / Virus Database: 2411/4953 - Release Date: 04/22/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Tony Moss Email
To the best of my knowledge and belief, Tony Moss' new email address is: tonylindi...@talktalk.net Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2180 / Virus Database: 2437/5100 - Release Date: 06/29/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: a way to determine the period of insolation of a wall, using an analemmatic sundial
Willy, <> A very useful fact for me to know, as I live at 53º 22’ North, quite close. In fact, 5.9 miles from the junction of the A41 and M53. Mike Shaw 53º 22'N 03º02'W www.wiz.to/sundials - No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2193 / Virus Database: 2437/5108 - Release Date: 07/03/12 --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Using analemmatic sundials for determining sun exposure times
What am I talking about, I mean 6 months on a vertical cylindrical wall at the north (or south) pole, not a mere 24 hours. Mike Shaw --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sombrero as a sundial
Oops, I seem to have inadvertently upgraded Sir George White to a Lord. My apologies. Put it down to my recent dealings with the (now late) Duke of Westminster. Thanks to those who have kindly pointed out my error. Mike --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: The duration of the year
Doug, I didn’t answer your second question: "Assuming that in 1850s I had access to a good transit telescope, and a reasonable clock (daily errors about 1 second a day), how would I refine the quarter of a day into several decimal places?” The formula is: Year = (1 day – transit time difference) / transit time difference Mike Shaw 53º22’N 3º02’W --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: [BSS]
I've just received the email below from one Benbow Bullock. You might like to have a browse round his web site, it's certainly worth a visit. Mike Shaw 53.37N3.02W www.wiz.to/sundilas == my web site www.artnut.com/tournesol.html tells about the evolution of my series of abstract sundial endless column series of sculptures. the tallest is "Ode to the Snark" fifty feet high and mounted on the roof of the Oakland Museum. Others are at the Grounds for Sculpture, Hamilton, New Jersey; Parco Sculptura del Chianti, SIENA; The Chicago Athenaeum Sculpture Park; and St Supery Winery, Napa Valley. I currently in the process of fabricating 2 prototype endless column sculptures that will incorporate dichroic glass panels. The dichroic glass interference filters I use will transmit yellow light energy and reflect blue light. These filters are 99% efficient in transmitting and reflecting light at selected frequencies. Benbow Bullock, Sculptor Vallejo, CA [EMAIL PROTECTED]
Pilkington & Gibbs Heliochronometers
In case it is of any help to anyone, I've put some diagrams of the various types of Pilkington & Gibbs Heliochronometers on my web page. Follow the link on the home page to "Pilkington Gibbs". There's also some photos of a dismantled Type 1 showing how they work. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Exact Time and date conventions
<> I have always admired the poem that Andrew James wrote - see it on my web page - follow the link to "Poem" If memory serves me correctly, it was written by Andrew in response to a competition run on this sundial list by Tony Moss a few years ago. How appropriate that Andrew has also been contributing to the current thread. The convention yearmonthdayhourminutesecond has the advantage of allowing computers to sort lists into chronological order. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sundial 'poetry'
Andrew James is also a great "clock man". A limerick which I have used as a memory aid for many years, concerns the required length of a pendulum. It's always a mystery to me and I've never been able to see Why each tick and each tock Of a grandfather clock is 2 pi root L over g Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Shakespeare/Sundials
<<"Shakespeare was the inspiration for my business name. "Walking Shadow Designs">> I worked for a some time as a detergent powder formulator. I like to think that "Persil Washes Whiter" as a result of my inspiration, also from Macbeth: "Out, damned spot! out, I say!" Macbeth (V, i, 38) Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Mal assoniac!
With all your former teaching experience, haven't you got a friendly Chemistry teacher who can get some for you? Otherwise there is always a chemical supplier eg www.sci-chem.co.uk They have an enquiry line 0845 165 0845. For school supplies another problem may be the cost, as they tend to be analytical grade. You can buy it on eBay, but I notice that all the suppliers are in the USA. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Mal assoniac!
Ammonium Chloride toxicity: Harmful if swallowed. May be harmful by inhalation. Skin, eye and respiratory irritant. Mike --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Buyer's Guide
Fellow enthusiasts, I get really annoyed about the sundials that I see on sale in garden centres here in the UK. The people who make them seem to have no conception about how they work. As they are invariably horizontal dials, I thought I would put a "Buyer's Guide" to such dials on my web site. I think there are 5 golden rules - have I missed any? Check it out - follow the link from my home page. Helpful comments welcomed. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Buyer's Guide
Thanks to all who have sent me helpful advice and comments on the "Buyer's Guide" I put on my web page. Some I have incorporated, and some not. I was trying to give very simple advice to non-sundial enthusiasts, who just would like one in their garden, and are thinking of buying one "off-the-shelf", just so that they don't get a hopeless one. I thought some of the suggestions were a bit too complex for the downright novice to follow. To the doubters, I really have seen one with a twisted gnomon - it has a Welsh Dragon motif, with a twisted tail as the gnomon. It's in my local garden centre. I'll try to get a photo of it. Thanks to all on this wonderful list. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Buyer's Guide
Frans, <<how to instruct setting the correctorientation? That aspect is missing from your 'golden five'>> Omitted deliberately. There seem to be plenty of instructions about how to set up a sundial, so I was just trying to help people chose one. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: The Gnomonic Cipher - An Italian Job
I have heard a little whisper that Frank is speaking at the next BSS conference, so I wonder if we can anticipate an update. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Bitter at Twisted
There were one or two members of the list who were a bit sceptical of my claim to have seen a horizontal sundial with a twisted gnomon. I went down to my local garden centre yesterday and took a photo of one as proof - you have to look carefully to see the twist. I've posted a picture of it, with a couple of other examples of their dials, on my web page at: http://homepage.ntlworld.com/jmikeshaw/page21.html There is a whole stand of rubbish made by a Company called "Black Country Metal Works". The really worrying thing is that their leaflet has the BSS logo on it, with the proud boast, "We are members of the British Sundial Society". Just the sort of thing to bring the BSS into disrepute. (Would you like a copy of the leaflet Doug?) Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Door Knocker Gnomon?
<http://www.wiz.to/sundials/ and click on "more favorites" I think that the Sir Isaac Newton dial shown there us using the index finger as a gnomon with the "book" as the dial.>> Not quite. John Davis' dial shows Isaac Newton holding a triangle (representing a prism) with a hole in the centre which projects a spot of light onto the dial face. By coincidence, just above the picture is a "John Carmichael", and just below it is an "Aten" Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Google at the Equator
Bill G. said: <> I have also noticed that, according the Google Earth, the meridian line at the Greenwich Observatory (surely correct) is at 5.26 minutes West. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Google Earth accuracy
Bill G. said: <> I have also noticed that, according the Google Earth, the meridian line at the Greenwich Observatory (surely correct) is at 5.26 minutes West. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Google Earth accuracy
<> Oops! Quite right. Mike --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Pilkington & Gibbs
Fellow dialists, You occasionally see Pilkington & Gibbs Heliochronometers for sale on eBay. Recently, a southern hemisphere model was offered for sale. The seller did not know it was designed for the southern hemisphere. It could have been disappointing for the buyer as well. If anyone is interested, I have put a couple of photographs on my web site, illustrating the differences at: http://homepage.ntlworld.com/jmikeshaw/page19.html Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Paris: Sundial working with Fiberglass
I made a fibre optic sundial once, a long time ago. Follow the link on my web site. Mike Shaw 53.37N3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Ballistics - way, way off topic
I am trying to solve a ballistics question for a friend. If there's anyone out there who thinks they can help, could you please contact me off list. If you're not interested, stop reading now. Mike Shaw 53.37N 3.02W www.wiz.to/sundials === If you're still with me The Problem. Two vehicles are perpendicular to each other, about 100 meters apart on parallel roads. There is a rifle on vehicle A, and a target on vehicle B 1) Vehicle A is stationary, B is moving. Where do you aim? (in front of the target, easy) 2) Vehicle A and Vehicle B are both travelling at the same speed. Where do you aim? 3) Vehicle A is moving, B is stationary. Where do you aim? Let's ignore air resistance and the effect of the earth's rotation. Any help appreciated.--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Ballistics, way, way off topic.
Thanks to all who replied to my query earlier today. Everyone gives me the same answer, so I'll take it that I now know the answer. If not interested, stop reading here. Mike Shaw 53.37N 3.02W www.wiz.to/sundials = Two vehicles are both travelling in the same direction on parallel roads, rifle on A, target on B. 1) Vehicle A is stationary, B is moving. Where do you aim? 2) Vehicle A and Vehicle B are both travelling at the same speed. Where do you aim? 3) Vehicle A is moving, B is stationary. Where do you aim? Assuming the vehicles travel at 100 ft/sec and the bullet takes 0.1 sec to reach the target then 1) 10 ft in front of the target 2) At the target 3) 10 ft behind the target. --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Article in March BSS bulletin
I have a Kate Pond Skywatch. Photo at: http://homepage.ntlworld.com/jmikeshaw/Pond.jpg Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: New Burghley House Sundial
<< It has been designed by a former curator at Harvard USA.>> Wasn't Will Andrewes the curator of scientific instruments at Harvard? He designs sundials. He is now in business selling them. Could it be one of his? Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Equation of Time
Duane, The easiest way, I think, is to combine the longitude correction and the Equation of Time graph. You can then just apply one correction without the need to calculate in the longitude correction into the dial. See: http://homepage.ntlworld.com/jmikeshaw/page13.html for an adjustable one. Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Unavailable
Should anyone be trying to contact Tony Moss by email - he has asked me to let you know that his computer system is down, and is likely to remain so for a few days. Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Fw: Mystery object
Campbell Stokes sunshine recorders are still available - I have one that I bought a few years ago. They are made by Fairmount Weather Systems of Cambridge, UK. Their web site is: http://www.fairmountweather.com/ Mike Shaw 53.37N 3.02W www.wiz.to/sundials --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: A new mosaic Analemmatic, in Australia - plus a 'suggestion', for this List
Linda, Good idea, but you're supposed to put your latitude and longitude in there as well :-) ... And no cheating you others - recent photos only. Mike Shaw 53.37N 3.02W www.wiz.to/sundials <>--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Sundials marked in Universal Time
Larry, <> Not true for the general public. Astronomically true though, as events were (are?) recorded using the Julian day, which does start at noon GMT. This universal method avoids any historical misinterpretation of date and time. Looking at old dials doesn't help, as the 24 hour system wasn't in general use. On a dial, 12, could be either noon or midnight. Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Fontburn sundial
There's a nice little video about Tony Moss and the Fontburn reservoir sundial on the BBC web site. See: http://news.bbc.co.uk/1/hi/england/7701026.stm Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Experimental Method for Earth Radius
<> == Now, I'm no mathematician, as anyone will tell you but Isn't it because the earth is a sphere, but the wall isn't? If you had two concentric spheres, the shadow cast on the outer one from the inner one would move at a constant speed. When you watch the sun disappear at a constant rate, it is because you are standing on the inner sphere and you are not moving. Well it makes sense to me (I think). Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: A unique occasion
And of course next year we will have 05:06:07 08/09/10 Then in the years after, 06:07:08 09/10/11 07:08:09 10/11/12 08:09:10 11/12/13 Then it starts to get difficult, depending upon your nomenclature. Here in the UK we use dd/mm/yy not mm/dd/yy. Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: 52 YEARS OF MATH
Now that we are all having a rant - I'd like to raise the issue of "52 years of punctuation" Please consider joining the "Apostrophe Preservation Society". All you have to do to become a member is promise to carry around with you a large felt tipped pen and ostentatiously correct all errors that you see. Great fun in the shops. Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: gnomon protection - shadow ridge dials
<> I made an incremental fibre optic dial a few years ago using a much simpler system. See: www.wiz.to/sundials/and follow the link to "Fibre Optic" (we spell it like that in the UK). Mike Shaw 53.37N 3.02W --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Dials and clocks
Brian, There's Press release at: http://www.bathnes.gov.uk/BathNES/media/press+releases/2005/Visitor/PR2334.htm which mentions both the clock and sundial. It also gives an email for the Heritage Manager and asks you to make contact for further details. You could give it a try. Mike Shaw 53.37N 3.02W www.wiz.to/sundials--- https://lists.uni-koeln.de/mailman/listinfo/sundial
[no subject]
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I see from today's Google Doodle that it’s the 325th anniversary of John Harrison’s birth. One of my heroes. Mike Shaw 53º 22’ N, 3º 02’ W--- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
[no subject]
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I have been contacted by a lady who lives in Germany who has recently inherited a Pilkington Gibbs heliochronometer. She wishes to sell it. It is an early Type 2, serial number 169. I am assured that it is in working order. If anyone is interested, contact me directly and I will send photos and put you in touch with the vendor. Mike Shaw 53º 22'N, 3º02’W --- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Analemmatic sundial
Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I’ve just been down and taken a better picture of the Port Sunlight analemmatic. Mike Shaw --- End Message --- --- https://lists.uni-koeln.de/mailman/listinfo/sundial