Example of an Andrewes Longitude Sundial
Texas Christian University (TCU) in Fort Worth Texas will unveil a new longitude sundial on May 5th, 2015. As William Andrewes, creator of the longitude dial explains, "The Longitude Dial is based on an idea proposed in 1607 by Franz Ritter of Nuremburg...Ritter devised and published a world map projected from Nuremburg, with its lines of longitude arrayed to serve also as hour lines. However, the difficulties of creating a new project for each location and the expense of producing it in durable materials were considerable. Ritter's gnomonic projection map does not appear to have been developed for use in sundials - until now." See Andrewes website at: http://www.longitudedial.com/index.html
One of Andrewes sundials will be unveiled in front of Walsh Performing Arts Center, situated in the middle of a circular stone plaza. Andrewes monumental sundial prices start at $50,000. Read more at TCU-360 news
As an interesting side note, the gnomonic project map upon which Andrewes creates his sundials was extensively used during World War II and into the 1950's by high frequency (HF) direction finding (DF) sites. On the gnomonic map not only are lines of longitude straight, but any great circle line of bearing is straight as well. Using a pin on the DF site, the lines of bearing could be drawn with an extended piece of string. Computer calculations eventually replaced the manual direction finding and geolocation method.
Of the 101 things that play in Peoria, the Pekin Illinois Sundial in Mineral Springs Park is rated #59, and billed as the World's greatest sundial in Pekin, Illinois. Even Google Maps marks the Pekin Sundial. The Pekin Park District says: "picturesquely located in the Sunken Gardens in Mineral Springs Park, this unique sundial tells the hours before or after noon and the highest point of the sun on a given day. More interesting information is available on the earth, sun, planets and latitude and longitude at the site."
The Peroria Journal Star interviewed Hentry Cakora, now 79, who built the dial using his family business, Tazewell Machine Parts and convinced the Pekin Park District to provide land for its construction in the Sunken Gardens of Mineral Springs Park. It's easy to spot on Google Maps just south of Court Street near the park's Lagoon that from spring through fall offers a pedalboat rides.
Cakora who knew about the sun's motion and was good at mathematics created a complex set of sundials. The main sundial is a horizontal dial about 6 feet tall of burnished steel, surrounded by hour marks on the ground. But if you're there near noontime there are extra treats. At the base of the sundial is a thin upright triangle split down the middle allowing it to cast a narrow beam of light toward the noon mark. Then there is a pole just north of the dial with two flat nodi about 12 inches in diameter, each having a hole in the center. The lower nodus casts a shadow that each hour falls on an analemma that allows correction for the sun's irregular "Equation of Time". Charts explain this to the observer as well. The upper nodus casts its shadow on a noon mark analemma, with small stakes to indicate the soltices and equinox.
Nearby is a planet. Is it part of a planet trail that starts from the Park's nearby fountain? Or is there another astronomical explanation? In any event, if the Pekin dial isn't one of the World's greatest, Cakora declares “I’m sure, by far, it’s the most accurate."
Read about it in the Peoria Journal Star: http://101.pjstar.com/59-worlds-greatest-sundial/ and see at: http://www.pekinparkdistrict.org/sundial.html
I would like to send you the direct link to more details on this competition, as I believe it may be of interest for some members of the NASS (I saw the Art and Literature section in the "Teachers Corner"). The deadline for submitting entries is coming soon - 31 March:
“Words and Light” is a tribute to all the writers who were inspired by Light, writers who were interested in the Science of Light, and scientists who were also poets. The Competition is dedicated to Mikhail Vasilyevich Lomonosov and Johann Wolfgang von Goethe, celebrating the publication of the grammar book by Lomonosov written in 1755 which reformed the Russian literary language by combining Old Church Slavonic with the vernacular (160th anniversary in 2015), and to the book "Theory of Colours" (Zur Farbenlehre) by Goethe, published in 1810, which contains detailed descriptions of phenomena such as coloured shadows, refraction, and chromatic aberration (205th anniversary in 2015).
Dr. Ana Luisa Simoes Gamboa
Associate Professor, Department of Industrial Ecology
ITMO University (Saint Petersburg National Research
University of Information Technologies, Mechanics and Optics)
Saint Petersburg, Russia
+7 911 716 37 22
SOLART2 by artist MA2F
UNESCO has declared 2015 the International Year of Light and Light-Based Technologies (IYL-2015). For sundialists, the inauguration of SOLART2 on the June 2015 solstice may be the highlight. SOLART2 is the largest IYL-2015 artistic sundial project in Europe. It is located in Rivesaltes at the northern entrance of Perpignan, France. It was initiated in 2013 as a strong symbol of sustainable development. Artist MA2F (Marc-Andre 2 Figuères) is constructing the sundial with an incredibly large gnomon created from a double metal bar with numbers silouhettes cut into the structure. The dial is meant to illustrate the flow of matter and energy, projecting a continually changing shadow of numbers onto the dial face during the progression of solar time. The edges of the gnomon are painted red "as a visual value and mastery of light". You can see a video of the dial at: http://ma2f.com/pages/solart2.php
Your opportunity to register for the 2015 NASS Conference is NOW. Don't delay. This year the June 18-21 conference will be in beautiful Victoria, BC. The article "Plan for 2015 NASS Conference" reminds you to plan your travel early. Cost details for the conference and NASS attendee discount rates at the Harbour Tower Hotel are available in the download attachment provided below. If you would like to present a talk, display a sundial project, or give an informal 5-10 minute presentation, please fill out those items on the registration form and mail your registration to Fred Sawyer as soon as possible. Remember, the conference is in June and time is running out. SEE YOU IN VICTORIA.
http://www.tourismvictoria.com/ : “Boasting the mildest climate in Canada we are green and beautiful year-round. In fact, Vancouver Island, where Victoria is located, is rated the TOP ISLAND in the Continental US and Canada and one of the TOP TEN ISLANDS IN THE WORLD by the 2012 Travel+Leisure World's Best Awards. We were even rated as the #1 DESTINATION TO VISIT IN CANADA by the 2010TripAdvisor Travelers' Choice Awards. You should really come here.”