February 1994 page 8
J. G. Freeman

A Method of Determining the North and Latitude

Describes a method using stereographic projection to determine true north and latitude from solar shadow observations. Includes theoretical explanation and practical setup.
How Sundials Work, Mathematics of Dialling

October 1993 page 23
J. G. Freeman

Determination of Local Solar Time by Observing a Shadow on Three Occasions

This article presents a geometric method for determining three unknowns (direction of North, latitude and today's solar declination) from three angular measurements of a vertical pole's shadow. It outlines the mathematical formulae and step-by-step calculations required to find the three unknowns.
How Sundials Work, Mathematics of Dialling

February 1991 page 18
J. G. Freeman

A Latitude-Independent Sundial.

Introduces the concept and a model of a sundial designed to tell time without needing to be constructed or adjusted for the specific latitude of the observer. The design utilizes a gnomon with a curved edge and relies on determining the sun's position based on its declination, altitude, and azimuth. The article details the construction of the scales, noting that the model has accuracy limitations, particularly at certain times of day
Dials: Unusual, Mathematics of Dialling, DIY Sundial Projects

July 1991 page 27
Gordon E. Taylor
Denis Schneider
J. G. Freeman

Letters to the Editor

This section compiles letters on diverse sundial topics. Gordon E. Taylor recounts issues with sundial projects undertaken by the uninformed, while Denis Schneider discusses possible errors in tidal dial information and moon dial prospects. J.G. Freeman provides a crucial formula for wall orientation calculations. Allan Mills proposes using N and S extensions to the polar axes of a spherical model earth as gnomons, bringing the noon mark to where it would be expected (rather than at the terminator).
The BSS and Members