French inventor and maker of things Julien Coyne of Mojoptix has created an intriguing digital sundial gnomon that can be 3D printed. His software design (dated 13 October 2015) uses the 3D open software OpenSCAD described as "The Programmers Solid 3D Computer Aided Design Modeller".[http://www.openscad.org/about.html].
The North American Sundial Society likes to record public sundials that are in good or excellent condition. Dial #797 in Cranford, New Jersey is a sad exception. In 1972 the Kiwanis Club of Cranford presented a 15-foot diameter sundial to Union College as an expression of interest in the college and the youth of Cranford. But the years have taken a toll where it sits adjacent to the William Miller Sperry Observatory. The dais stonework mortar has given way and the concrete dial face has deteriorated.
A plan to restore the dial is underway. Dr. Stephen D. Nacco, of Union County College, Vice President, Administrative Services & Executive Assistant to the President set up a Sundial Fund under the Union County College Foundation, a 501(C ) 3 not-for-profit organization. Donations can be made online via the Web Site, http://www.uccfoundation.org/give.html with the donor selecting GIVE ONLINE NOW. Choose Donation Type "Other", and then put “Sundial” in the Additonal Comments Area as the reason for the donation.
Checks can be made out to:
Union County College
1033 Springfield Avenue
Cranford, NJ 07016
The large analemmatic sundial in front of the Harton Theater North Entrance of Southern Arkansas University (SAU) is being formally dedicated on Thursday, November 5th, 2016 in memory of the late David Thomas Smith, a 1957 SAU alum and retired assistant director of the SAU Physical Plant.
The Smith Sundial, funded by family and friends of David Smith was built by the SAU Department of Art and Design and engineers of the SAU Physical Plant. Patrick Finney was the construction supervisor and Steven Ochs was the project concrete art designer and craftsman. As described in the NASS Sundial Registry, Dial #800 is "a 22 by 17 foot analemmatic dial of stained concrete with Arabic hour numerals of polished brass. The dial perimeter and hour numerals are set in a blue decorative polymer "U" arc, appearing as a large mule shoe that represents the university Muleriders mascot symbol. Dial colors represent the royal blue and gold school colors."
As reported by Southern Arkansas University, "The Smith Sundial at SAU is one of only four Arkansas sundials that are registered on the North American Sundial Society, and the only one outside of Little Rock and North Little Rock. It is also the only sundial in the state that is [a monumental] analemmatic..."
Goikhman explains: " The Greenwich Globe's shape was generated by an algorithm that treated time as physical matter. Each additional hour is represented through a constant degree of elevation and a 15o angle bend. The elevation based map projections gives easy-to-read shape to the complex man-made system of time-zones. It also operates as a sundial, a play on the now familiar row of world time clocks. The shadow it casts on a wall is meant to be read as a world watch. Each spike in the shadow shows the local time at a corresponding geographical region."
As reported in Design Bloom architect Kikuma Watanabe has designed a beautiful modern house integrating asundial and solar design principles: "The internal spaces support a comfortable environment where in summer it is naturally cool and in the winter it is warm. This ecological technology aids this passive system using the sun and the wind for an effective air conditioner."
The interior of the house has two-story rooms and lots of natural wood. But unlike other houses except perhaps for the Cosmic Room in Corregadora, Mexico, it has a built in equatorial sundial. Central stairs lead up to the equatorial dial projection area with the gnomon itself a glass slit window in the roof. But the most important aspects for solar comfort are the angles of the eve overhangs, preventing hot summer sun from entering the windows yet allowing warming sunlight to enter during the winter . Brighter areas such as the kitchen are situated in rooms with southern exposure while the living room faces east looking out upon ponds and hills. Upstairs surrounding the equatorial dial projection ring are two rooms: the Room of Sunrise and the Room of Sunset, and on the main floor facing north is the Room of Shadow.
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