Did you know that Thomas Jefferson designed sundials and thought that a book of trigonometric tables was one of his most valuable books? And that Benjamin Franklin made a "modest" proposal for an extension of the noon-day sundial canon? Join Fred Sawyer, eminent sundialist and president of the North American Sundial Society as he explores sundial history with the United States founding fathers George Washington, Benjamin Franklin and Thomas Jefferson in three video presentations. The videos are taken from a presentation he made two years ago at the annual meeting of the NASS in Indianapolis. See these videos at: http://www.sundials.org/index.php/dial-links/videos/historic-sundials
Learn more about sundials, their construction and their history by joining the North American Sundial Society. Go to http://www.sundials.org/index.php/join-nass/join-nass and join now.
Sundials are often created at the instersection of science and art. Quilting has made its mark as well. For example in Burnsville North Carolina is the Quilt Block Sundial, painted in bright quilt blocks on a 8x8 foot board above the entrance to the Yancy Common Times Journal Building.
Now comes Altazimuth Arts, an enterprise established by Sara Schechner, well-know historian of science who is curator of Harvard's Collection of Historic Scientific Instruments. But Schechner is also active in the Studio Art Quilt Associates, Quilters' Connection of Watertown MA, and member of Quinobeguin Quilters guild. As she explains, "Recent quilts are inspired by history and the night sky, the built environment wet within nature, and by the many-faceted meanings of tangible things."
Illustrated is the US Naval Observatory 26-inch refractor made by Alvan Clark & Sons in 1873. "The inspiration for my quilt was an engraving from a newspaper story celebrating the work of the telescope. The print shows astronomer Simon Newcomb (at the eyepiece) and Superintendent Rear Admiral Benjamin F. Sands (standing) in the dome with the brand new telescope in late fall 1873. The engraving was based on a photograph of the same scene." Visit Schechner site at www.altazimutharts.com
As reported in the ArchDaily.com website on 23April 2016 by Patric Lynch, the design group Prescription in conjunction with Arup have developed a sophisticated sundial based on the analemmic path that the sun travels throughout the year. The classic "8" shaped analemma is made into a cone (think of someone stepping on an ice cream cone) and repeated with esthetic cutting of the cone top for each hour. At the bottom of the cone is a stenciled hour number and the angle of the analemmic cone only allows sunlight to poke through the stencil for the appointed hour.
The original prototype of this dial was made of flexible plastic through a 3D printing process. Prescription believes that "...the design is 100% scalable; the designers foresee applications for the design in both park and festival pavilions and home installations..."
A video of this analemmic sundial by Grisha Zotov can be seen at https://vimeo.com/161675472
The Daily Sabah reports a 2,400 year old mosaic discovered during excavations in Turkey's southern Hatay provice that shows a skeleton that according to archeologist Demet Kara fromthe Hatay Archeology Museum has an inscription that translates from ancient Greek to say "Be cherrful, and live your life."
Perhaps more interesting to sundialists is the mosaic further right. It is of a Roman attending the bath. Demet Kara explains, "...there is a sundial and a young clothed man run[s] towards it with a bare-headed butler behind. The sundial is between 9 and 10 am. 9am is the bath time in the Roman period. He has to arrive at supper at 10am. Unless he can, it is not well received. There is writing on the scene that reads he is late for supper and writing about time on the other."
Kara added, "[This is] a unique mosaic in Turkey. There is a similar mosaic in Italy but this one is much more comprehensive. It is important for the fact that it dates back to the third century BCE...Antiocheia was a very important, rich city. There were mosaic schools and mints in the city. The ancient city of Zeugma in [the southeastern province of] Gaziantep might have been established by people who were trained here. Antiocheia mosaics are world famous."
With all due respects to Shakespeare, time will always be with us, and signifies quite a lot. The Harvard-Smithsonian Center for Astrophysics is organizing a symposium dedicated to Time and Culture to be held 5-9 June 2016 at Harvard's Northwest Lab. According to the symposium organizers:
"The symposium aims to set the stage for future timekeeping standards, infrastructure, and engineering best practices for astronomers and the broader society. At the same time the program will be cognizant of the rich history from Harrison's chronometer to today's atomic clocks and pulsar observations. The theoreticians and engineers of time will be brought together with the educators and historians of science, enriching the understanding of time among both experts and the public."
The definition of the second has changed several times over the last 40 years and likely will change again before the end of this decade. Should timekeeping be decoupled from the rotation of the earth? We already abstract time with zone time (such as Eastern Standard Time) and minipulate it to fit our activities (using Eastern Daylight Saving Time). We no longer worry about the moment of sunrise or sunset, rather that we go to work at 9:00AM or have a class that lasts from 10:00-10:50AM. Indeed, "ante and post meridian" may be obsolete.
"The future of timekeeping is evolving with the development of optical frequency standars, the consideration of high-order relativistic effects, and the challenges of distributing trusted timescales at even higher preicision....A closer look at time in astronomy and other sciences, as a defining element of modern civilization, is needed." Read more and register for the symposium at: http://timesymposium.org