For their valuable help and suggestions, I am thankful to Gerhard Betsch, University of Tübingen; Jens Høyrup, Roskilde University; Niklas Thode Jensen, Danish National Archives; Sean Kelley, University of Essex; Jesper Lützen, University of Copenhagen; and Laura Søvsø Thomasen, Royal Danish Library.
Toke Lindegaard Knudsen is an Associate Professor of Mathematics at the State University of New York at Oneonta. He teaches SUNY Oneonta’s course on the history of mathematics, which is aimed at students preparing to be high school mathematics teachers. He is passionate about introducing the students to the history of mathematics education, especially the local history of SUNY Oneonta. His research has mainly focused on mathematical astronomy and cosmography in ancient and medieval India