Mapping Time is an account for the general reader of the history & underlying basis of each of the most important calendars of the world, from antiquity to modern times. There are descriptions of prehistoric calendars, of those devised by the Egyptians, the Mayans, the Aztecs, & other civilizations, of the short-lived French Republican calendar, which introduced a ten-day week, & of our present-day Gregorian calendar. This fascinating & highly entertaining book is the perfect guide to understanding the background of time in the run up to the millennium. `an easily accessible mine of material` TLS ` Richards makes even the most arcane complications arising from the accident of Earth`s spin & orbit seem fascinating` New Scientist.