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North American Sundial Society

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Founding Fathers - Washington Dial at Mt. Vernon, VA

In August, 2014, the North American Sundial Society had a terrific conference in Indianapolis, Indiana, discussing sundial topics from the sundials of Our Founding Fathers where Fred Sawyer talked about the sundials and stories of George Washington, Benjamin Franklin, and Thomas Jefferson. 

Greek Dial from Ai Khanum

Another highlight was Jack Aubert's talk on the mysteries of an ancient Greek sundial found at Ai Khanum in the northern of Afghanistan and computing the hour lines.  Who built this dial more than 2000 years ago and what kind of mathematics did they use?

Peggy Gunnerson described the evolution of a modern sundial parallelpipeds sculpture, creating an artistic and unusal east-west sundial.  And Stephen Lueking presented a series of modern sundial designs for DePaul University.  These were just some of the presentations.  Subscribe to the digital edition of The Compendium from NASS and receive them all.  The annual Sawyer Dialing Prize went to Robert Kellogg for NASS outreach and the invention of a digital sundial.  Read more about the presentations and the tour of Indianapolis by downloading the attachment below.

Peggy Gunnerson Parallelpiped Dial
Stephen Luecking - Dial Design for DePaul University

Hosting 46 people, the conference was coordinated by George and Betsy Wilson and Mark an Phyllis Montgomery.  During the Friday Sundial tour NASS was welcomed by Eagle Elementary School, the senior high ability class and their teachers.  All gathered in the school's courtyard to show a large horizontal sundial, dedicated as a memorial to a former teacher, Linda Eads.

Attachments:
Download this file (2014_Conference_Indianapolis_IN.pdf)2014 Conference Indianapolis IN[ ]1138 kB

This Sundials for Starters appeared in The Comendium in June 2010

by Robert Kellogg, Ph.D.

Some years ago I had the thrill of reading the Tiberius manuscript1, which in Old English presented a horologium, a set of shadow lengths, from somewhere in England. The shadow lengths were given throughout the year, such as on Christ’s Mass day where “the shadow at [mid] morning and nine [halfway through the afternoon] is twenty [less] a heel foot and at midday four and twenty.” 

1 MS Cotton Tiberius A, iii – folio 179 o/v British Museum, Manuscript Library

Read more: Meridiana

This Sundials for Starters appeared in The Compendium in December 2013

Robert L. Kellogg, Ph.D.

Fig. 1 Analemma over the Acropolis photographed during the year by Ayiomamitis

As the shadows grow longer and we head for the winter solstice my mind turns again to the analemma, a concept invented by Grandjean de Fouchy in 1740 to describe the apparent irregular motion of the sun. Strictly speaking, this is the difference between the right ascension of the true sun minus the right ascension of the mean sun. While this is mathematically important to astronomers, it is esthetically pleasing that the apparent sun will describe a “figure 8” through annual motion in the sky. This “figure 8” or analemma is visible only when the sun’s position is compared to a “mean time” using a precise clock. The analemma (or the sun’s apparent East-West motion called the Equation of Time) allows us to answer the question “Will the time shown on my sundial be fast or slow compared with my watch?”

Read more: Analemma and the Equation of Time

This Sundials for Starters appeared in The Compendium in March, 2006

by Robert L. Kellogg, Ph.D

I usually get up at 7am (ante meridian), but unlike ancient farmers, the time of rise has almost nothing to do with sunrise. One June 21st, and just west of Washington D.C. my sunrise occurs at 5:43 am Eastern Daylight Time (EDT). That would be 4:43 am Eastern Standard Time (EST) if we left our clocks alone. I’m almost due west of Washington D.C. and the Ellipse in front of the White House. Interestinglyu, my sunrise will occur about 44 seconds after sunlight rises on the White House.  How does this relate to longitude?

Read more: A Matter of Longitude

Sawyer Prize to Robert KelloggAt the 2014 NASS Conference in Indianapolis, Indiana, Fred Sawyer announced this year’s Sawyer Dialing Award is given to Robert Kellogg, “who, through his constant outreach, his unflagging support of NASS, and his technical ingenuity, as evidenced by his invention of the digital sundial, has helped to usher dialing into the modern age.”

Bob designed and patented a digital sundial based on sunbeam projection, first considered when he was at the US Naval Postgraduate School.  But it took more than a decade for those ideas to gel into a firm technical form and a US Patent.

Bob continues to write “Sundials for Starters”, a regular column for NASS's Compendium. Over the last several years he has organized the joint NASS-Analemma Society outreach at the US Science and Engineering Festival and has brought sundialing to Montgomery County Schools in Maryland for the last 20 years.

Fred Sawyer presented Bob with an award certificate, the traditional cash prize of $200 and a custom made Spectra Sundial by Jim Tallman of Artisan Industrials.

http://www.artisanindustrials.com/world-of-sundials/spectra-sundial-potomac.html

2013_CHSI_PocketSundial
[CHSI - Harvard Collection]

Appropriate to NASS’ visit, Harvard had just recently completed a new major exhibit entitled “Time and Time Again” offering conference members a unique view on the changes in time keeping and the social impact of timekeeping technology.  On Friday afternoon, NASS members followed the Time Trails through the Harvard campus, locating historical sundials “in the wild” and timepieces in the Semitic, Peabody, and Natural History Museums.

The day was finished by two presentations “Trading in Time: European Pocket Sundials Designed for Colonial Use in American Territories by Sara Schechner and “Portable Sundials in Austrian Museums” by Ilse Fabian.

During Saturday a plethora of sundial talks were presented by NASS members, including “Counting the Sunny Hours” by Roger Bailey to a new “Wandering Gnomon Sundial Designn” by Fred Sawyer.  Bob Kellogg presented the making of an animation illustrating the Ibn al-Shatir sundial proposed for Observatory Park in Virginia for the Analemma Society.  One of the most color presentations was Art Paque’s update on Solargraphy, illustrating the technique of forming daily images of the sun a photographic paper that at the last is digitally scanned and preserved.

Attachments:
Download this file (2013_Conference_BostonCambridge_MA.pdf)2013 Conference BostonCambridge_MA[2013 NASS Annual Conference]822 kB

Read more: 2013 Conference - Boston/Cambridge

NASS_2013_Andre_BouchardAndré Bouchard received the 2013 Sawyer Dialing prize at the Boston NASS Conference “In recognition of two decades of promoting, preserving, extending and  exemplifying the pairimoine of Québecois of dialing and gnomonics.”

During the first 15 years of the CCSQ (la Commission des Cadrans solaires du Québec) André made numerous presentations on gnomonics, adopting objective and descriptive ways in order to highlight the specific elements of particular dials and dialist styles.  Now as editor of The Gnomonist / Le Gnomoniste, André is rediscovering the fundamentals of philosophy through sundials, showing that they merge both in time, place, casting symbolic meaning and beauty within their surrounding.  André illustrated this by discussing the design of the 2008 sundial on the shore of the St. Laurence River at Point aux Outardes Park near Baie-Comeau, where the polar gnomon and its supports simulate bull rushes, augmented by a flight of geese.

Fred Sawyer presented André with an award certificate, the traditional cash prize of $200 and a custom made Spectra Sundial by Jim Tallman of Artisan Industrials.

Subcategories

  • Sundials for Starters
    Article Count:
    6
  • Conferences
    Article Count:
    23
  • Sawyer Dialing Prize
    Fred Sawyer, in cooperation with the North American Sundial Society, established a continuing yearly award, the Sawyer Dialing Prize to be presented by NASS to an individual for accomplishments in or contributions to dialing and the dialing community.
    Article Count:
    19
  • Terwilliger Sundials
    In these pages is the famous tub sundial created by Robert Terwilliger using his laser trigon to lay out hour lines on a very irregular surface to create a working sundial.
    Article Count:
    1
  • Biographies

    Who are today's sundial artisans?  Here are several bioghraphies of several artisans that show the unique combination of talents in art, engineering, and mathematics.

    Article Count:
    6