Hi all, Martha had difficulties getting this reply throught to the list and asked me to relay the following: - - - - - - - - - - - - - - - - - - - - - - - - - - - Dave,
Many thanks for your nice comments. My friend José C. Montes and I, we both follow the great topics you deal on the list, and we have learn a lot from you! At first... sorry for my English The terminator line was a great idea from José, and we decided to enlarge the Mexican Republic to the whole globe an put a small point to indicate Torreón (the place where we live) and locate the terminator line just there. The globes are 6 plane (not convex) circular stones made in green dark granite worked with sandblast. The night half is represented with neat granite and the sunlight rough with sandblast. At first we thought about convex globes, but it was highly expensive on granite. As the analemmatic ellipse is very pronounced here in Torreón (lat 25° 32'N), there is no enough place to insert the globes on the correspondent hour site, but we placed the Solstices globes in a imaginary second ellipse bigger than the hour ellipse. It means, the shadow at sunrise or sunset in the Solstices will be cast on the respective globe. (Also each globe has carved the sunset and sunrise hour). Frans Maes has been following all the sundial construction and he kindly solved our doubts and contributed with a web page for this sundial!! Thanks again Frans.. Martha A. Villegas 25° 32' N 103° 27' W Torreón, Coah. México ----- Original Message ----- From: "Dave Bell" <[EMAIL PROTECTED]> To: "Sundial List" <sundial@rrz.uni-koeln.de> Sent: Monday, February 10, 2003 5:31 PM Subject: Re: Analemmatic sundial in Torreón, Mexico On Mon, 10 Feb 2003, Frans W. Maes wrote: > An enthousiastic group, headed by Martha Villegas, has established a > beautiful analemmatic sundial in Torreón, Mexico, probably the first one in > the country. > > Read all about it at: http://www.biol.rug.nl/maes/torreon/welcome-e.htm Wow! A beautiful dial, indeed, and a very nice set of pages describing it. > A special addition here are the terminator maps, depicting the twilight line > across the Mexican Republic at local sunrise and sunset on three dates. The maps are quite interesting in themselves. Obviously, there was a talented tile artist involved in the project! Are the maps shaded, to illustrate the terminator (and contrast in the time digits), or are they convex surfaces that actually *display* the terminator? I'm thinking here of the globe-in-miniature (Terella?) dials... > Regards, > Frans Maes > 53.1N, 6.5E Dave 37.28N 121.97W - -
