February 1999 page 49
John Singleton

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

October 1998 page 12
Manfred Hüttig

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

October 1993 page 13
Michael Hickman

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