Christoph Rothmann's Discourse on the Comet of 1585 offers the first edition of the Latin treatise after it was published in 1619. It is accompanied by an English translation and a full introduction and commentary.

Miguel A. Granada, Ph.D. (1978), University of Barcelona, is Professor of History of Renaissance Philosophy at the same university. He has published many monographs, translations and articles on Giordano Bruno and the astronomical and cosmological revolution in the early modern period.

Adam Mosley, Ph.D. (2000), University of Cambridge, is an Associate Professor in History and Classics at Swansea University. His publications include Bearing the Heavens: Tycho Brahe and the Astronomical Community of the Late Sixteenth Century (Cambridge University Press, 2007).

Nicholas Jardine, is Emeritus Professor of History and Philosophy of the Sciences, University of Cambridge. He is author, with Alain Segonds, of La guerre des astronomes, 2 vols (Les Belles Lettres, Paris, 2008).