September 2023
Page 35

Stairwell Sundial, University of Michigan

Describes a cylindrical sundial (Dial 1085 in the NASS Registry) located in a stairwell of the University of Michigan Energy Institute, seen during the NASS Conference bus tour. The nodus is formed by the centre of the eight radial arms supporting the skylight, and the markings include a toposcope.
Dials: Cylindrical, Dials: Unusual, Sundial Design & Layout

Frank King

February 1999
Page 49

A Fixed Pillar Dial

This article describes a fixed pillar dial, a variant of the Shepherd's Dial, which indicates time without requiring cylinder rotation. It features a radial gnomon whose tip's vertical shadow length and position on the cylinder's wrapped surface (calibrated by specific formulas) distinguish morning from afternoon.
Sundial Design & Layout, Dials: Cylindrical

John Singleton

October 1998
Page 12

Analysis of the Sundials on the Tower of the Winds, Athens: Possible Parameters Used in Construction

This article presents a detailed analysis of the ancient sundials on the Tower of the Winds in Athens using high-precision geodetic data. The study aims to identify the cardinal design parameters, such as geographic latitude, ecliptic angle, and gnomon length, used in their construction. It explores historical measurements and proposes a plausible interpretation for the cylindrical dial.
Dials: Cylindrical, Historical Dials, Mathematics of Dialling, Sundial Design & Layout

Manfred Hüttig

October 1993
Page 13

Shepherds and Spreadsheets

This article explores using spreadsheet programs to design and create shepherds' dials, simplifying the complex calculations and plotting involved. It details the process of determining the sun's altitude using a mathematical formula and setting up a spreadsheet to generate the necessary data for plotting hour lines on a cylindrical dial, facilitating DIY dial construction.
DIY Sundial Projects, Dialling Tools, Dials: Cylindrical, Mathematics of Dialling

Michael Hickman