On the 20th. January over 120 pupils at Cheney School in Oxford learnt about the principles of solar time-keeping and ancient Greek and Roman dials, saw a demonstration of how they work and built their own hemicyclium dial – all within the space of an hour. The event, organised by the IRIS project as part of an ancient astronomy day, saw Chris Williams deliver a wide-ranging lecture on how the ancients told the time and the differences in their requirements for timekeeping and those we have today. An extract of the presentation, including various pictures of classical dials, can be seen here.
David Brown then took over, first demonstrating how shadows vary depending on the time of year and why a hemicyclium is more practical than a hemispherical bowl,
before each pupil was presented with a kit to make their own.