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How Sundials Work

Devised and created for the British Sundial Society by Tony Moss BSc DLC "The Lindisfarne Presse"

Part 1

The fundamentals of how we tell the time from the sun, with the Equatorial Dial.

The globe

Part 2

Different types of sundial derived from the Equatorial.

Polar dial as part of a globe

Part 3

The differences between 'Clock Time' and 'Sun Time'

The reasons why you have to make adjustments to convert the time shown by the sundial into that shown by a clock.

Different times at different longitudes

Part 4

Essential considerations when designing a sundial.

Sundial diagram
© The British Sundial Society: 2024