RE: BSS Bulletin
I've distributed over 80 past copies to newly qualified teachers over the past couple of months and one item of discussion is why this has not been on HIGNFY, so I wondered if it is one of them that have passed on details. ATB, Peter Ransom To: jmikes...@ntlworld.com; sundial@uni-koeln.de Subject: Re: BSS Bulletin Date: Sat, 24 May 2014 04:53:32 -0400 From: tonylindi...@talktalk.net I wonder who made the connection? Tony Moss -Original Message- From: jmikes...@ntlworld.com To: Sundial List Sent: Fri, 23 May 2014 23:48 Subject: BSS Bulletin Good to see the British Sundial Society’s Bulletin featured on this evening’s edition of “Have I got News For You” on BBC1 Mike Shaw 53º 22' North 03º 02' West www.wiz.to/sundials No virus found in this message. Checked by AVG - www.avg.com Version: 2014.0.4592 / Virus Database: 3950/7549 - Release Date: 05/23/14 --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: I found out (graphic) a theorem
Dear Willy, I was intrigued by your findings and have asked around about the result.John Sylvester of King's College, London has identified it - here is his reply. This is a known result, Frégier's theorem, and S is the Frégier point of P w.r.t. the conic. (It doesn't have to be an ellipse.) Proof probably easiest by complex projective geometry. The orthogonal lines through P are line-pairs of an involution on the pencil at P, and cut an involution on the conic. S is the vertex of this involution. If you want to fill in the gaps, take the conic as y2 = xz, P as (t2, t, 1), and the lines PX, PZ as the united lines of the involution (X = (1,0,0), Z = (0,0,1)). With a bit of work, S comes out as Y (0,1,0), unless I made a mistake. It appears as an exercise in Semple & Kneebone, Algebraic Projective Geometry, p.153, ex. 16. (No proof, of course.) You can also find a statement of the theorem at http://mathworld.wolfram.com/FregiersTheorem.html (but not a proof), and in Wells' book, referenced there (but no proof, again). Interesting extension: the locus of S as P moves around the conic is a second conic, concentric and homothetic to the first. There is something about this at http://tech.groups.yahoo.com/group/Hyacinthos/message/21195 All the best, John So, many thanks indeed Willy for sending this interesting result around, but sorry that you cannot name it Leenders Theorem! Best wishes, Peter Peter RansomPresident Designate, The Mathematical Association From: willy.leend...@telenet.be Subject: I found out (graphic) a theorem Date: Sun, 3 Feb 2013 23:11:15 +0100 To: sundial@uni-koeln.de In his book "Die Sonnenuhr und ihre Theorie" (The sundial and his theory) Jörg Meyer writes on page 200 (my English translation): I found the following remarkable theorem in the book of Heinz Schilt. 'Ebene Sonnenuhren' (Plane sundials) Through the point P where all the hour lines of any sundial come together, a circle is drawn.The center M and the radius of the circle are irrelevant.The hour lines whose hour angle differ from each 6 hours or 90 ° were grouped into pairs.The points where the hour lines of a pair intersect the circle, are connected with a chord (a straight line joining the ends of an arc )Then is applicable: all these chords pass through a common point Q. In the study of this case and assuming that the projection of a circle is an ellipse and vice versa, I found out (graphic) the theorem: Of all right triangles, inscribed in an ellipse, of which the right angle point (point P) is common, the hypotenuses intersect in the same point (point S). See drawing. I found that theorem never formulated, certainly no proof. Who can prove this theorem? Willy LeendersHasselt in Flanders (Belgium) Visit my website about the sundials in the province of Limburg (Flanders) with a section 'worth knowing about sundials' (mostly in Dutch): http://www.wijzerweb.be --- https://lists.uni-koeln.de/mailman/listinfo/sundial <><>--- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: Are there any commercially-available 'Teaching Sundials', for schools ? - YES!
Hi Matina and friends, A couple of years ago I had the good fortune to be responsible for the sundials case study on the Bowland DVD that was sent to all state schools in the UK. This DVD contains 21 case studies for 11-14 year olds to use in mathematics lessons, the objective being to enthuse them about mathematics. The materials can be downloaded free of charge in the UK by visiting www.bowlandmaths.org.uk Then click on 'Run the Bowland Player online' Then click on 'The case Studies' and find the sundials one - there's LOTS of sundial related material there which was tested in schools and made it through to the final DVD. All mathematics faculties in state schools in the UK received this DVD. However outside the UK there is a charge of £200 for the DVD since the cost of all the work was met by the Bowland Charitable Organisation. Enjoy! Peter Ransom > Date: Fri, 22 Apr 2011 12:19:19 +0100 > From: martina.addisc...@gmail.com > To: sundial@uni-koeln.de > Subject: Are there any commercially-available 'Teaching Sundials', for > schools ? > > > Is anyone aware of a commercially-available large 'Teaching Sundial', which > would be suitable for fulfilling that part of the UK National Curriculum ? > > As many of you no doubt know, sundials are included in the Science section > of that curriculum, but each school decides for themselves how to cover it. > > We had originally intended to mark an interactive "analemmatic" dial on to > the playground - but our local Educational Authority will not give us their > permission for that, because of the 'health and safety' implications (as > basically they feel that such layouts are too dangerous for the children). > > It had also been suggested to us that a large globe-of-the-world might be a > good way to cover the necessary aspects (Latitude/Longitude, daily rotation > of the earth, night/day, annual change of seasons, etc) - but we feel that > there has to be something better and more 'sundial-specific', if only we > can trace suppliers of any suitable item being sold at a reasonable price. > > Len Honey at "Science Replicas" suggested an individual portable dial, for > each pupil - but (apart from the cost), we think that those would soon get > damaged (or simply 'go missing'). Instead, if this is possible, we would > prefer one large 'demonstration' sundial - ideally in wood or plastic (not > metal, as that would be expensive, plus too heavy for a teacher to hold). > > Though Mr Honey offered to have something specially designed/manufactured > for volume sales to schools, it is likely to take some time to implement. > > Hence my plea to this Mailing List - asking if there are any 'commercial > Teaching Sundials' already on the market, and if so, can anyone point me > towards the supplier of them. We have a budget of 500 Pounds, for this. > > Sincerely, > > Martina Addiscott. > > > -- > > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Beijing - a word of warning!
We visited the Forbidden City in August and were very disappointed not to see the large equatorial dial there. Due to restoration work if is covered in scaffolding and you cannot get near it. It looks as though this will be the case for at least the rest of this year. The bonus was that there is a smaller version in the Hall of Mental Cultivation that the tour guide took us through in the Forbidden City! Peter Ransom > From: [EMAIL PROTECTED] > To: [EMAIL PROTECTED]; [EMAIL PROTECTED] > Subject: Re: Sundials in Hong Kong? > Date: Wed, 17 Oct 2007 21:34:28 -0700 > > Hi Doug, > > Are you also visiting Beijing? If not you should at least do an internet > tour of sundials in China, specifically Beijing. Two items of interest in > Beijing are the equatorial dial in the Forbidden City and the Beijing > ancient observatory. There are many pictures of the equatorial dial. The > background of the ancient observatory is much more interesting. This > observatory was started about 1441 with the Ming Dynasty. The images of the > western style instruments are very familiar. These include: an armillary > sphere, an azimuth theodolite, a celestial globe, a quadrant, a sextant and > a theodolite. The Jesuits transplanted these western astronomical > instruments to China in the early 1600's. These instruments very similar to > those used by Tyco Brahe. It is interesting that this was already ancient > technology when it was transferred. These were the instruments used before > the Copernican revolution and the telescopic observations of Galileo. It was > the astronomy of Ptolemy and Aristotle and the Pope. The earth was at the > center of the universe and the sun moved, rising and setting each day. > > The Chinese did not see the need this inoculation the western science of the > universe according to the Jesuits. They had armillary spheres hundreds of > years before, probably based based on the detailed instructions in Ptolemy. > Book 5 "On the construction of the astrolabe", or their independent > discovery of this classical geocentric model of the universe. The Chinese > astronomer Zhang Heng even built a hydraulically powered rotating armillary > sphere in the 2nd century AD. See > http://en.wikipedia.org/wiki/Armillary_sphere > > The Chinese looked at the western instruments and mechanical clocks as > interesting toys but they revealed nothing that wasn't already known in the > "Celestial Empire". They saw no need to trade with the west or to adopt > their religions. This was later forced on them during the opium wars by the > British thirst for tea. How could Britain insist on pushing drugs to trade > for tea. Unfortunately this is the history of Hong Kong. Things have not > changed. They continue to have much more to sell to us than we can sell to > them. > > Enjoy your trip. I certainly did when I was there 15 years ago. This was an > significant cultural awakening for me. Travel can be an enlightening > experience. An interest in sundials has often taken me past the regular > tourist routes and encouraged a different level of exploration. > > Regards, > Roger Bailey > www.walkingshadow.info > > - Original Message - > From: "Douglas Bateman" <[EMAIL PROTECTED]> > To: "Sundial List" <[EMAIL PROTECTED]> > Sent: Tuesday, October 16, 2007 2:11 AM > Subject: Sundials in Hong Kong? > > > >I am to visit Hong Kong next week for a 6 days and will naturally look > > out for sundials. > > > > I know of one already - a bronze armillary by Joanna Migdal at the > > Royal Hong Kong Golf Club in 1989. > > > > I would be grateful if anyone could let me know of other dials. > > > > Regards, Doug > > --- > > https://lists.uni-koeln.de/mailman/listinfo/sundial > > > > > --- > https://lists.uni-koeln.de/mailman/listinfo/sundial > _ Help yourself to FREE treats served up daily at the Messenger Café. Stop by today. http://www.cafemessenger.com/info/info_sweetstuff2.html?ocid=TXT_TAGLM_OctWLtagline--- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: teachers of dialling
Many thanks to Frank for raising this. One of the most useful books I use in tracking down details of dialmakers is the Index of British Mathematicians Part III 1701-1800 by Ruth V & Peter J Wallis This book contains details of about 20,000 (yes, twenty thousand) mathematicians, such as Samuel Walker (1716-1782) who was a teacher of mathematics, diallist and ironmaster at Grenoside and Masbrough in the West Riding of Yorkshire. There is even a picture of a multiple dial by him! (illustraction 7c). To get all the information into one volume the font is small and many abreviations are used such as TM for teacher of mathematics, MIM for mathematical instrument maker etc. In the early 90s I used to meet weekly with Peter and Ruth to discuss history of mathematics and dialling. Unfortunately Peter died in 1992, but Ruth completed the work and it was printed the following year. It would be an admirable project for someone to sort through all the references and pick out the teachers of dialling (in which category I class myself - more details early next year when a case study on dialling for schools will appear). Carpe diem Peter Ransom Teacher of mathematics From: Frank Evans <[EMAIL PROTECTED]>To: Sundial <[EMAIL PROTECTED]>Subject: teachers of diallingDate: Sat, 16 Jun 2007 17:25:59 +0100>While early dial makers are quite well catalogued we know less of those,>most of them schoolmasters I believe, who merely taught the art of>dialling to others. Here are some examples:>>William Emerson (1701-1782) was an outstanding mathematician (he refused>election to the Royal Society), stonemason and failed schoolmaster who>lived in the English village of Hurworth, County Durham. He was said to>be a man of choleric temperament, hence the collapsed school. We have a>handsome dial of a pupil of his in the village with the inscription "C>Hunter 1772 54 deg. 34'">>Thomas Haswell was the much loved and respected "Maister"who spent>nearly fifty years in charge of the Royal Jubilee School at North>Shields, Northumberland in the nineteenth century. His life was>memorialised by a descendant, Geo. H. Haswell and in the volume is a>chapter devoted to the Maister's globe. A page reads:>"The globe, with its extraordinarily facile methods, taught at once, and>to the eye as to the imagination or intellect, the antipodal relations>of the various land and water surfaces, the relative surface curvature>of different land masses, the rationale of seasonal changes and the>sun's spiral path between the tropics; the phenomena of sunrise, noon>and sunset, and their variation according to latitude, of twilight and>dawn in different parts of the world.. The subject of dialling, too,>regarded by many as an abstruse mathematical one, was as it were,>incidentally unfolded in using the globe.">>At Cambo, Northumberland, "Miss Richardson had charge of a manuscript>list of scholars attending Cambo School, 1784-1805, made out by the>retiring master, William Robson.. Mr. Robson undertook to teach the>following special subjects, and did so in many cases:->Mensuration, book-keeping, trigonometry, surveying of land, dialling,>gauging, navigation, algebra.">>Any further additions?>Frank Evans>55N 1W>>>>>>-->No virus found in this outgoing message.>Checked by AVG Free Edition.>Version: 7.5.472 / Virus Database: 269.8.17/850 - Release Date: 15/06/2007 11:31>>>--->https://lists.uni-koeln.de/mailman/listinfo/sundial> Get a preview of Live Earth, the hottest event this summer - only on MSN --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Time in Rutland
Hi everybody, I've just purchased a book - Time in Rutland: A history and Gazetter of the Bells, Scratch dials, Sundials and Clocks of Rutland for £24. (p+p is extra) This is a substantial (400 pages, hardback) book, by Robert Ovens and Shiela Sleath, published by the Rutland Local History & Record Society. The appendix refers to 100 sundials. The book is packed with illustrations. Anyone passing through Rutland should not be without this book - it is tempting me to spend a few days there this month. For details on obtaining a copy, go to http://www.rutnet.co.uk/rlhrs/page7.htm Happy reading! Peter RansomThe new MSN 8: smart spam protection and 2 months FREE* -
Re: Spare copies of a book with pop-out models to make
One's on its way to you today. You got in just in time - think I'll go down to Southampton today to see if they have any left as they are a good buy. Here's my address 29 Rufus Close Rownhams SOUTHAMPTON SO16 8LR Great Britain Are you aware of my book, A Dozen Dials, published in 1998? It's A5 in size, pp viii + 56 It consists of the 12 articles on sundials that I wrote for the British Society for the History of Mathematics Newsletter from summer 1992 to summer 1997 plus futher information that came to light during subsequent correspondence. I can do the two books for £9 (15 or $19) since the postage on a combined package would be less than on two seperate ones. Looking forward to receiving your letter! Best wishes for the New Year, Peter From: "Frans W. Maes" <[EMAIL PROTECTED]> Reply-To: sundial@rrz.uni-koeln.de To: Subject: Re: Spare copies of a book with pop-out models to make Date: Thu, 2 Jan 2003 08:59:33 +0100 Hi Peter, I definitely would like to sign up for one copy. Thanks! Frans - Original Message - From: "peter ransom" <[EMAIL PROTECTED]> To: Sent: Thursday, January 02, 2003 12:31 AM Subject: Spare copies of a book with pop-out models to make Today I was fortunate to liberate (at a discounted price of £2 each) 10 copies of the book TIME by Silke Ackermann and Paul Buck published by the British Museum at £8.99. This is an A4 book with 32 pages plus 4 pages of press-out-and-make models of a universal equatorial dial (there are two separate models - one for each hemisphere), a nocturnal (again, one for each hemisphere) and a perpetual calendar. It even comes with a small compass on the front for your equatorial dial! I am happy to send one copy to the first 11 people who reply (off list) and request my address so they can send me £3 (UK only - cash or cheque) or 10 Euros (or a £5 note) (Europe) or $8 (rest of world) in used notes to avoid horrendous bank charges. The difference in price is due to the cost of the book plus postage. People in the UK may find the book for sale at The Works (a publishing outlet shop) if there is one handy. Happy New Year to everyone. Peter Ransom (Hampshire, GB) ps Quite an auspicious day as my daughter also got engaged today! _ MSN 8: advanced junk mail protection and 2 months FREE*. http://join.msn.com/?page=features/junkmail - - _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail -
Spare copies of a book with pop-out models to make
copies of the book TIME by Silke Ackermann and Paul Buck published by the British Museum at £8.99. This is an A4 book with 32 pages plus 4 pages of press-out-and-make models of a universal equatorial dial (there are two separate models - one for each hemisphere), a nocturnal (again, one for each hemisphere) and a perpetual calendar. It even comes with a small compass on the front for your equatorial dial! I am happy to send one copy to the first 11 people who reply (off list) and request my address so they can send me £3 (UK only - cash or cheque) or 10 Euros (or a £5 note) (Europe) or $8 (rest of world) in used notes to avoid horrendous bank charges. The difference in price is due to the cost of the book plus postage. People in the UK may find the book for sale at The Works (a publishing outlet shop) if there is one handy. Happy New Year to everyone. Peter Ransom (Hampshire, GB) ps Quite an auspicious day as my daughter also got engaged today! _ MSN 8: advanced junk mail protection and 2 months FREE*. http://join.msn.com/?page=features/junkmail -
A new sundial group
mathematics sent me the following details about a new sundial group in Iran. I also have a picture of the analemmatic dial. If you want me to send a jpeg of it, please contact me off-list. Best wishes to all Peter Ransom Friday 27 September 2002 was the first day of establishment and formal activity of a "Sundial Group" as a working branch of the THAQIB Astronomical Society in Rasht (centre of the Gilan province in northern Iran, on the southern coast of the Caspian Sea). The seat of the Society is in a newly built beautiful park, which is planned to become a "Sundial Park". At present there is an analemmatic sundial in this park that attracts many visitors to the park. The members of the Sundial Group (mostly young schoolgirls) plan to study the history along with mathematical, astronomical and artistic aspects of sundials, which provide them with a concrete application of the mathematical courses, especially trigonometry. They are supposed to be in charge of designing several sundials for the cultural buildings in the whole province in future. Any comments or communications may be sent to to: Sundial Group, Thaqib Astronomical Society, P.O. Box 13145-1785, Tehran, IRAN Report by Mohammad Bagheri _ Surf the Web without missing calls! Get MSN Broadband. http://resourcecenter.msn.com/access/plans/freeactivation.asp -
Re: Gatty 4 or Eden & Lloyd.
I saw the ad yesterday (or was it Sunday?) on the abe website. I seem to remember hearing that this had been reprinted a few years ago, but this is the first copy I've heard that's come available in the last 18(?) months. If my memory serves me correctly I read about a reprint copy about 2 years ago. Sorry I can't be more precise. Peter Ransom _ Send and receive Hotmail on your mobile device: http://mobile.msn.com -
RE: Why the clock rotates clockwise?
At least one early mechanical clock did rotate once every 24 hours. See Wells cathedral clock! Peter RansomMSN Photos is the easiest way to share and print your photos: Click Here -
A sundial trade catalogue
I've just acquired a very nice piece of dialling ephemera. It is a trade catalogue, 8 inches by 5 inches high, entitled "Where SunDials are Made". It describes, with illustrations, text and in some cases prices, of sundials (vertical, annalematic (yes, spelt that way), combination (horizontal and annalematic), universal) and pedestals available from E.B.Meyrowitz, optician of New York (3 addresses), St. Paul, Minneapolis and Paris. There are 13 interior pages with illustrations and text, and a nice illustrated cover. The only indications of date are 1902 on the vertical sundial and "Copyright 1908 by E.B. Meyrowitz" on the back cover. I'm happy to photocopy this and send a copy to anyone who sends me £2, 5 Euros, or $5 cash (sorry - I don't want to pay the horrendous bank charges on small cheques) to cover the cost of copying and postage and packing. Peter Ransom 29, Rufus Close Rownhams Southampton SO16 8LR UK _ Send and receive Hotmail on your mobile device: http://mobile.msn.com
Re: Acadian domestic sundials
Sorry not to get back on the details I promised last night. I've sent Steve a jpeg of the dial, and anyone else who wnts to see it can contact me off list and I'll send the jpeg to them. Details follow with correct spelling! The window sill is at the chateau at Crosville-sur-Douvre, Manche, France. I saw it in August 1991, as there was a sundial exhibition of Manche sundials in the chateau. The holes (notches?) are intriguing, and I imagine they were used to hold an inclined gnomon. This was the first year I was interested in dials, and I did not have a ruler with me while we were on holiday, so I do not know the size of the dial, but the picture was taken by leaning out the window to get above the dial. My memory suggests a diameter of about 15 cm. There was also a vertical scratch dial on the nearby church, and a vertical dial on the Presbytery. Peter Ransom _ Join the worlds largest e-mail service with MSN Hotmail. http://www.hotmail.com
Re: Acadian domestic sundials (again)
In 1992 I visited a chateau near Cherbourg in France (Crosville sur Douvre I think it was, but I'll check on that when I get back from school). On one of the windowsills there was a sundial scratched into the horizontal surface, not accurate enough to be classified as a proper sundial but more than a scratch dial. It was a semicircle of diameter between 10 and 15 cm from what I remember. I'll sort out exact details later this evening. I have never seen a similar dial, and wonder if this is of the type described. Peter Ransom Southampton, UKGet your FREE download of MSN Explorer at http://explorer.msn.com.
Re: Sundials in Iceland?
Thingvellir in Iceland. The site is, I believe, the site of Icelend's first parliament (930 AD). Those in the Radio Solent with tiome to spare tomorrow (Wed 11 july) may like to listen to Radio Solent at 11.10 am as I've just done a quick chat on sundials for them. It may be pushed to 11.10 am on Thursday if they manage to record an item with an astronaut before tomorrow. Peter Ransom Southampton _ Get your FREE download of MSN Explorer at http://explorer.msn.com
Lumbutts sundial
My brother, Ken Ransom, has some new pictures on his web site, and invites members to view them. Lumbutts is near Todmorden in Yorkshire. Take a look at http://sun_dial.tripod.com/sd_lbutts.htm Best wishes, Peter Ransom _ Get your FREE download of MSN Explorer at http://explorer.msn.com
Re: Baltic sundials/ St. Petersburg
I photographed 7 years ago. They stand on one of the obelsik mileposts, of which I think there are few. On the east side it says 'To Moscow 675' and there is a line below the 675 with 2 under it. Unfortunately I do not have the site reference, but seem to remember it was on the main road into the city from Moscow. The obelisk is about 6-7 metres high. If anyone is interested I will scan one of my photos, and email it if you send me your address. My host for the week had asked about sundials, and this was the only outdoor one she had traced. Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
warning notice about a new virus
comes in time! Peter Ransom NEW VIRUS I have received the following message today: "We have been informed of a new virus - WOBBLER. It will arrive on email titled 'How to give your cat a colonic'. IBM and AOL have announced that it is very powerful, more so than Melissa and there is no remedy. It will eat all your information on the hard drive and also destroys Netscape Navigator and Microsoft Internet Explorer. Do not open anything with this itle and please pass this message on. Not many people seem to know about this yet so propagate it as fast as possible. This information was announced on last Thursday by IBM. Please share it with everyone in your address book so that the spreading of the virus may be stopped. This is a very dangerous virus and and there is no remedy for it at this time. Please practice cautionary measures and forward this to all your online friends ASAP." __ Get Your Private, Free Email at http://www.hotmail.com
nice pictures of dials and scientific instruments
Get a look at www.mathsyear2000.org/museum/index.html for some great pictures and information on dials and scientific instruments. Maths Year 2000has a great website packed with games and puzzles for children and information and resources for parents, schools and colleges. The museum page appears to have been set up by the Museum of the History of Science. There is also an excellent article in Sphaera no. 10 the newsletter of the museum of the History of Science, Oxford on a 16th century astronomical compendium. To be put on the mailing list (no charge) contact Jim Bennett, Museum of the History of Science, Broad Street, Oxford, OX1 3AZ email [EMAIL PROTECTED] Peter Ransom __ Get Your Private, Free Email at http://www.hotmail.com
Grants for sundials - help!
I'm involved in setting up a millennium dial for next year, and would like to apply for grants to help with the cost of resurfacing a cracked area, as well as constructing the dial. The dial will be in the UK. Does anyone know of any bodies to whom I can apply? Any help would be most welcome. Many thanks Peter W 01? 30' N 50? 58' __ Get Your Private, Free Email at http://www.hotmail.com
Anybody heard of ... ?
has anyone heard of the Sun Dial Association and the British Association for Sun Dials? Someone mentioned that they have funding for millennium sundials, and i'd like to know more. Of course I know of The British Sundial Society, but haven't heard of these. can anyone help? Thanks for all the response about analemmatic dials and shepherd dials. It appears the matter is not quite as straightforward as I thought originally! Cave canem Peter Ransom __ Get Your Private, Free Email at http://www.hotmail.com
request re analemmatic dials
I would like to know whether the equation of time is used when an analemmatic dial is read. I have pictures of human analemmatic dials where the position of the gnomon is indicated by an analemma, and some where the position of the gnomon is indicated by dates on a central straight line. Both cannot be correct! My gut reaction is that the analemma takes care of the equation of time automatically, but would like confirmation of that, and whether the analemmatic dial with dates on the straight line need equation of time correction. Does one use the equation of time on a shepherd's dial? What happens to the e. of t. in a leap year? Should we have a new e. of t. each year? Thanks for your help. Carpe horam Peter Ransom __ Get Your Private, Free Email at http://www.hotmail.com
