This volume of collected essays, the first of its kind in any language, investigates the Astronomical Diaries from ancient Babylon, a collection of almost 1000 clay tablets which, over a period of some five hundred years (6th century to 1st century BCE), record observations of selected astronomical phenomena as well as the economy and history of Mesopotamia and surrounding regions. The volume asks who the scholars were, what motivated them to ‘keep watch in Babylon’ and how their approach changed in the course of the collection’s long history. Contributors come from a range of disciplinary backgrounds, including Assyriology, Classics, ancient history, the history of science and the history of religion. "Babylon has always exerted a magical charm on everyone who has been told of its splendour and grandeur. Nobody who has succumbed to this charm, whether he is a layman who just wants to browse a little in his search for old secrets, or a scholar who wants to inform himself about the latest academic research, will be disappointed by this volume." - Erlend Gehlken, Universität Frankfurt/Main, in: Bryn Mawr Classical Review February 2 (2020)

Dates form the backbone of written history. But where do these dates come from? Many different calendars were used in the ancient world. Some of these calendars were based upon observations or calculations of regular astronomical phenomena, such as the first sighting of the new moon crescent that defined the beginning of the month in many calendars, while others incorporated schematic simplifications of these phenomena, such as the 360-day year used in early Mesopotamian administrative practices in order to simplify accounting procedures. Historians frequently use handbooks and tables for converting dates in ancient calendars into the familiar BC/AD calendar that we use today. But very few historians understand how these tables have come about, or what assumptions have been made in their construction. The seven papers in this volume provide an answer to the question what do we know about the operation of calendars in the ancient world, and just as importantly how do we know it? Topics covered include the ancient and modern history of the Egyptian 365-day calendar, astronomical and administrative calendars in ancient Mesopotamia, and the development of astronomical calendars in ancient Greece. This book will be of interest to ancient historians, historians of science, astronomers who use early astronomical records, and anyone with an interest in calendars and their development.

Volume 38 opens on 1 July 1802, when Jefferson is in Washington, and closes on 12 November, when he is again there. For the last week of July and all of August and September, he resides at Monticello. Frequent correspondence with his heads of department and two visits with Secretary of State James Madison, however, keep the president abreast of matters of state. Upon learning in August of the declaration of war by Mawlay Sulayman, the sultan of Morocco, much of the president's and the cabinet's attention is focused on that issue, as they struggle to balance American diplomatic efforts with reliance on the country's naval power in the Mediterranean. Jefferson terms the sultan's actions "palpably against reason." In September, he addresses the concerns of the mayor of New York City and the governor of South Carolina that free blacks expelled from Guadeloupe by the French will be landed onto American shores. Although he believes the matter will be dealt with by the states, he also instructs Secretary of the Treasury Albert Gallatin to direct custom house officers to be watchful. In late August, Jefferson is alerted that he has been touched by the "breath of Slander," when James T. Callender's accusations appear in the Richmond Recorder and make public his relationship with Sally Hemings. The president offers no comment, and a month later returns to Washington, where he continues planning for an impending visit by his daughters. Some images inside the book are unavailable due to digital copyright restrictions.