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Sundials, which decorate church walls, public plazas, and
elegant gardens, are first and foremost astronomical instruments.
Before understanding how sundials work, one must first understand
the apparent motion of the Sun in the sky. In this book, Denis
Savoie presents the basics of astronomy required to understand
sundials and describes how to design and build your own classical
sundial. Written to engage all levels of science readers, the
author shows the calculations involved in the sundial's
construction and also gives a comprehensive history of time
measurement.
The book begins with an introduction to cosmography through a
study of the Sun's annual and diurnal motions. The Celestial Sphere
and the local Celestial Sphere, the hour angle of the sun and the
equation of Time are all discussed. The author then moves to a
brief history of both sundials and time, giving the general
principles behind the sundial, the conversion of solar time to
clock time, and discussing the local meridian line. The gnomon and
the use of its shadow are also explained in detail. In addition,
many types of sundials and their different uses are described.
These include the polar, horizontal, and north-facing sundial, just
to name a few.
The practical and observational aspects of sundials will enable
readers to create custom-made sundial of their own, adding whatever
special features they wish to include. Most of these designs have
been tested by people with no previous knowledge of astronomy. To
aid the reader, the book is full of clear and instructive
illustrations and diagrams.
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