October 1997 page 10
H. R. Mills

A Model Depicting Some Astronomical Features of Stonehenge

This article describes a 48cm diameter model that depicts the horizon around Stonehenge. It shows the astronomical significance of the monument, particularly the alignment of the midsummer sun's rising and setting and the moon's major standstill rising with the four station stones. The model was constructed from 12 photographic transparencies and can predict solar and lunar events.

October 1995 page 37
H. R. Mills

Keeping Track of the Sun

A general article reflecting on the methods and motivations behind tracking solar time.

February 1992 page 19
H. R. Mills

The Azimuth Dial

This article describes the azimuth dial, a type of horizontal dial with a vertical style, derived from the equatorial dial formula. It explains that while a vertical style at the center of a horizontal circle cannot show time correctly throughout the year due to declination changes, projecting an equatorial circle onto a horizontal plane forms an ellipse for the hour lines. The article provides the formula for the shadow angle and suggests this as a useful project for understanding geometry and for practical marking in playgrounds or gardens.
DIY Sundial Projects, Dials: Analemmatic, Dials: Equatorial, Dials: Horizontal, Mathematics of Dialling

October 1992 page 25
H. R. Mills

A Portable Polar Sundial

This article introduces a portable polar sundial design that overcomes the issue of an infinitely long dial face for extreme hour angles. It uses two end-styles, which cast shadows for forenoon and afternoon hours, respectively. The dial can be adjusted using a wedge to correct for the Equation of Time or longitude.
DIY Sundial Projects, Dials: Polar, Equation of Time, How Sundials Work

October 1991 page 29
H. R. Mills

Letters to the Editor

This section includes correspondence from H.R. Mills, who details his homemade "heliochronometer" sundial based on the Gibbs and Pilkington type. He also discusses A.P. Herbert's "Housewife's Trick," warning against adjusting sundials by twisting them in azimuth to correct for BST, as this introduces variable time errors.
DIY Sundial Projects, Dials: Heliochronometer, Equation of Time