June 2023
Page 15

Wooden Sundial Puzzle

Provides detailed instructions and drawings for constructing an educational wooden sundial puzzle, measuring 125 × 125 mm. The project utilizes plywood and a satay stick as a polar gnomon, designed to be easy to assemble and explain the concept of solar time.
Construction Projects, DIY Sundial Projects, Dials: Polar

Peter de Groot

December 2019
Page 17

Cord Sundial in ’s-Graveland

Description of the design and construction of a large, interactive combination sundial located at the ’s-Graveland observatory in the Netherlands. The 5.5-metre dial combines a cord sundial, indicating local apparent time, with a horizontal sundial, showing Central European Summer Time. The article details the mathematical calculations, material choices (Robinia wood), and implementation steps for this educational project.
Construction Projects, DIY Sundial Projects, Dials: Horizontal, Dials: Unusual

Peter de Groot