Originally published in 1921, this book provides a concise guide to the Western Calendar. Information is provided on its origin and development, the principles of its construction, the purposes for which it is employed, its deficiencies and the means by which these deficiencies can be amended. The text also contains a list of authorities on the calendar and a table of astronomical data in mean solar time. This book will be of value to anyone with an interest in the Western Calendar and the measurement of time in general.