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Linda Manas – The History of the Calendar

Online

Linda looks at calendar developments from the ancient Metonic Cycle to the early Roman and Julian calendars and discusses methods of calculating the date of Easter Sunday from the advent of Christianity to Gregorian reforms and the Computus.

Mary McIntyre – Reflection, Refraction and Excitation

Online

The Hunt For Atmospheric Optical Effects - Mary has been passionate about hunting for atmospheric optics for many years. In this talk she will show us lots of the common things seen from the UK, plus some more exotic phenomena, from arcs and sundogs to noctilucent clouds and aurora.

Mike Frost – Isaac Newton and The Surrey Pumas

Online

An offbeat look at Newton's theory of gravity - featuring hollow Earths, counter-Earths Trojan asteroids, Kirkwood gaps, Lagrangian nodes, the three-body problem, and those mysterious beasts rumoured to haunt Surrey playing fields and Bodmin Moor. Already delivered on two continents!