December 2009
Page 34

A double catenary bifilar sundial for the Balearic Islands University Campus

This article describes a large and innovative bifilar sundial. It uses the intersecting shadows cast by two suspended chains hanging in catenary curves to indicate both the time and the date on a large tiled pavement. The article provides a summary of the complex mathematical calculations involved in its design.
Dials: Bifilar, Dials: Unusual, Mathematics of Dialling, Sundial Design & Layout

Rafael Soler

December 2007
Page 184

A Multiple Dial as a Monument to the Fishermen of Cala Figuera, Santanyi (Majorca)

This article describes a monument in Cala Figuera, Majorca, featuring three vertical declining bifilar sundials on the pedestal of a fisherman statue. Two dials face south, one east and one west, and the third faces north, declining east. The article details their bifilar gnomon design (semi-ellipse and straight line), delineation for hours and half-hours, and declination lines, along with the mathematical methods used for their design and calculation.
Construction Projects, Dials: Bifilar, Dials: Multi Faced, Mathematics of Dialling, Sundial Design & Layout

Rafael Soler