The collection of papers assembled here on a variety of topics in ancient and medieval astronomy was originally suggested by Noel Swerdlow of the University of Chicago. He was also instrumental in making a selection* which would, in general, be on the same level as my book The Exact Sciences in Antiquity. It may also provide a general background for my more technical History of Ancient Mathematical Astronomy and for my edition of Astronomi cal Cuneiform Texts. Several of these republished articles were written because I wanted to put to rest well-entrenched historical myths which could not withstand close scrutiny of the sources. Examples are the supposed astronomical origin of the Egyptian calendar (see [9]), the discovery of precession by the Babylonians [16], and the "simplification" of the Ptolemaic system in Copernicus' De Revolutionibus [40]. In all of my work I have striven to present as accurately as I could what the original sources reveal (which is often very different from the received view). Thus, in [32] discussion of the technical terminology illuminates the meaning of an ancient passage which has been frequently misused to support modern theories about ancient heliocentrism; in [33] an almost isolated instance reveals how Greek world-maps really looked; and in [43] the Alexandrian Easter computus, held in awe by many historians, is shown from Ethiopic sources to be based on very simple procedures.

This multidisciplinary work celebrates Wayne Orchiston's career and accomplishments in historical and cultural astronomy on the occasion of his 80th birthday. Over thirty of the world’s leading scholars in astronomy, astrophysics, astronomical history, and cultural astronomy have come together to honor Wayne across a wide range of research topics. These themes include: • Astronomy and Society • Emergence of Astrophysics • History of Radio Astronomy • Solar System • Observatories and Instrumentation • Ethnoastronomy and Archeoastronomy This exceptional collection of essays presents an overview of Wayne’s prolific contributions to the field, along with detailed accounts of the book’s diverse themes. It is a valuable and insightful volume for both researchers and others interested in the fields of historical astronomy and cultural astronomy.