Dear Josef Pastor, Thanks for your e-mail about the project in Recklinghausen. It's very impressive and especially the large sundial is interesting to the readers of this sundial list.
However, I want to make a remark to the picture of the sundial of Emperor August as showed on poster4. That picture is a copy of a drawing in the book "Die Sonnenuhr des August" by Edmund Buchner, 1982, page 43. Buchner describes the idea that in this sundial a "day light triangle" could have been present and draws 2 curved lines for this triangle. With this triangle may be read how many hours a certain day will be longer then the shortest day in winter. Following Buchner's description however, these 2 curved lines are wrong and should be 2 straight lines. In the bulletin of "De Zonnewijzerkring" nr. 84.2, september 1984, I wrote an article about this triangle and the error Buchner has made in his drawing. As a follow up RenĂ© R.J. Rohr gave a better proof that indeed this triangle should have straight lines and an article of Rohr ( in German ) was published in the Dutch bulletin nr. 85.1, february 1985. Rohr describes that one of the lines is a Babylonian hour line and the second is an Italian hour line and these lines are straight on a flat surface. A drawing with the correct triangle with straight lines may be found in the booklet "A Sundial for your garden" by Harold E. Brandmaier, 1995, page 2-10. I write this all because it would be a pity if a wrong drawing of the dial of Emperor August will be spread all over the world. Best wishes, Fer. Fer J. de Vries [EMAIL PROTECTED] http://www.iae.nl/users/ferdv/ Eindhoven, Netherlands lat. 51:30 N long. 5:30 E ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, May 17, 2001 9:29 PM Subject: Giant Sundial > Dear Dialists, > > the „Volkssternwarte and Planetarium Recklinghausen“ in Germany > is going to plan a giant sundial (30m in diameter) on top of the mine dump > „Hoheward“ within a park of horizontal astronomy. > You can get a first impression on the web on the homepage of the city of > Recklinghausen. There you will find 6 posters of which one is written in English > and some pages with description and astronomical data. > http:/www.recklinghausen.de/sterne/Haldenposter.htm > > Enjoy the design studies. > > Josef Pastor > recklinghausen > [EMAIL PROTECTED] > > -- > GMX - Die Kommunikationsplattform im Internet. > http://www.gmx.net >
