What's New Under The Sun

Tuesday, 21 April 2026 16:47

Heritage Auctions of Dallas, Texas, is auctioning a brass dial signed by "Patrick Hepburn, Marlborough, Maryland, 1720"..  The dial face has a rich green patina with rough but accurate engraving of Roman numeral hours, delineated with half, quarter and eighth hour marks. The dial has an eight point compass rose with lettered points.  Latitude is engraved as "LATT 39".The wide, but...

Sunday, 12 April 2026 21:30

Do you wonder what a Bifilar Sundial is? Or a Campbell-Stokes Recorder? Maybe you are studying facts about astrolabes and come across the word almucantar.  Are they rings in the sky? Our perhaps you want to make a vertical dial and need the trigonometric formula to draw the hour lines and have forgotten where to look.  All of these questions can be answered plus internet and NASS...

Monday, 06 April 2026 01:08

The Times Colonist in an article of March 28, 2026 by Hannah Link, reports that as of November 2026, British Columbia will change to permanent daylight time.  "That means sundials in B.C. will always be one hour behind, no matter the time of year, said Victoria-based sundial enthusiast Steve Lelievre." Photo: Times Colonist - The sun shines on the Sundial Garden in Beacon Hill...

Monday, 09 March 2026 15:10

Building on the success of the 2025 inaugural event celebrating world sundial day on March 20th, 2026. This global online gathering celebrates sundials, timekeeping, astronomy, history, art, mathematics, craftsmanship, and cultural heritage across the world. World Sundial Day was originally created by Esteban Martínez Almirón on his website Reloj Andalusí. World Sundial Day is celebrated...

Thursday, 22 January 2026 18:30

UPDATE:  We will have a special tour of the Kentucky Viet Nam Memorial Sundial.  See the attachment about the construction of this wonderful memorial. Get ready to travel. This year the 31th NASS annual conference will be held in Louisville, KY at the Hyatt Regency Hotel June 25th - June 28th. The conference starts Thursday June 25th at 4:30pm with an opening reception, introductions,...

Monday, 13 October 2025 22:49

On October 4, 2025 Madison Historical Society of Ohio was able to have their sundial returned after 32 years, when in 1993 it was moved to the lawn of Lake County Courthouse to reduce the chance of vandalism. The sundial was originally placed at Madison Home 100 years ago on Saturday, October 24, 1925 during a conference of the Women's Relief Society.  From 1904 to 1962 the state ran this...

Monday, 15 September 2025 19:42

NASS is pleased to announce the upcoming fifth instance of Elements of Dialing, our introductory course about sundials, their history, and the science that makes them work. The free 12-lesson course, intended for those are new to sundialing, runs from 27 October 2025 until 26 April 2026. The course instructor is Robert Kellogg, NASS Vice President and Sundial Registrar.  Bob will be...

Thursday, 11 September 2025 23:11

A Hungarian born American scientist, Mária Telkes (1900-1995), was called "The Sun Queen" and among other honors, was postmousthly inducted into the National Inventors Hall of Fame. She lived to 95 and for most of her life developed solar power in a variety of forms. Trained as a biophysicist, she worked for Westinghouse Electrical and Manufacturing Company in Pittsburgh, PA, where she...

Thursday, 28 August 2025 23:25

The annual NASS Conference was held 7-10 August, 2025 in Ottawa.  As usual, the conference began late Thursday afternoon with an introduction social and a "grab bag give away", taking your chances with tickets to win the bag's prize.  Will Grant was the final winner of the Walton Double Planar Polar Sundial, but Paul Ulbrich beat the statistic odds and won this prize three times,...

Tuesday, 10 June 2025 18:51

  Prosciutto di Portici (Ham) Sundial Photo: Getty Images The Prosciutto di Portici Sundial, more often called the Portici Ham Sundial, dates from the first century somewhere between  8 BCE to 79 CE.  This small silvered bronze dial was uncovered on 11 June, 1755 in the ruins of Herculaneum (current day Portici) in the "Villa of the Papyri", buried in...

Friday, 06 June 2025 21:01

  Sundial dedication May 31, 2025.  At left is Kathleen Stuckey Fox, with the City Proclamation presented by Mayor Pat Moeller and City Council on-lookers Carla Fiehrer and Susan Vaughn offering congratulations. On May 31, 2025 at 1pm, the Hamilton, Ohio, sundial (NASS Sundial Registry #1109) was re-dedicated in Monument Park. Originally dedicated in 1941 to the...

Monday, 24 March 2025 21:33

Several years ago Frans decided to write the course on sundials that included self assessment questions to force students not only to read the text, but to internalize the concepts. And a final submittal question "not necessarily a difficult question, but: no answer, no new lesson." Thus Frans Maes began writing lessons and sending them out to students. NASS has now used his material to create...

Volume III. William Emerson. Dialling 1770

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Emerson1770DiallingWilliam Emerson. DIALLING or The Art of drawing Dials, on All Sorts of Planes whatsoever.

"In Three Parts. Sect. I. The fundamental Principles of Dialling. Sect. II. The Practice of Dialling, illustrated on all sorts of Planes. Sect. III. Of describing the common Furniture of Dials; and the Construction of some useful Dials of other kinds. London. Printed for J. Nourse, in the Strand; Bookseller in Ordinary to his Majesty, 1770."  (206 pages, 10.7 MB)

Emerson (1701-82) was a schoolteacher and mathematician. He eventually gave up teaching and lived on the income from a small inheritance so that he could devote his time to study. He became an author well known for his “comprehensive grasp of all existing knowledge in all branches of his subject”. He published a defense of Newton’s Principia and authored a textbook on fluxions (calculus). Even 80 years after his death, “the works of this able mathematician…[were] still in high estimation”. The current work was originally bound with Emerson’s The Mathematical Principles of Geography. "[T]he first section contains the grounds of this art; by shewing, how the several requisites are to be found, by the intersections of the circles of the sphere, with the plane of the dial, from the principles of spherical trigonometry; from which the practical rules are deduced. The second section contains the practice, and that three different ways. 1. Geometrically, by rule and compass, which depends upon the gnomonic projection of the sphere… 2. By trigonometrical calculation, by the tables of sines and tangents, which is the most exact way. 3. By the lines upon Collin’s Dialling scale, which is a method extremely easy and ready. The third section shews the way of making some other sorts of dials; and drawing the furniture upon any common dial; that is the projection of the several circles of the sphere; and inserting therein, such hours as have been used by other nations. And tho’ these things are not absolutely necessary, they may serve sometimes as an ornament for a dial."

This can be ordered from LuLu Books: Emerson: Dialling Or The Art of Drawing Dials (1770)