The next Notre Dame History of Astronomy workshop is coming up this summer, with the deadline for submissions in a few weeks on February 1 at https://bit.ly/ndxvi-submit.  This year's workshop theme is Visual Practices in the Production and Transmission of Astronomical Knowledge. Visual practices are deeply intertwined with the production and transmission of astronomical knowledge. Visual features of texts and other materials take multiple forms, such as systems of numerical notation, hand-drawn geometric figures and illustrations, printed tables and charts of data, schematics of tools and instruments, high-resolution photographs and video, dynamic computer simulations, and even augmented-reality. Such material is often associated with the transmission of knowledge, but just as important was the epistemic role of visual reasoning and representations as historical actors collected information, raised questions, and developed theories to understand and explain astronomical phenomena. How were texts, images, and tables co-produced, and how did they interact to produce and transmit knowledge? What aspects of the visual layout and structure of a document were contingent upon the medium in which it was produced, or derived from the techniques and tools used to create it? What aims or functions were assigned to diagrams and other images, and what mental and material mechanisms allowed them to fulfill these purposes? How did certain visual practices or representations transform over time, and what was their relationship with changing practices of observation, experimentation, teaching, or computing? Attention to these and other visual practices provides a means for historians to gain insights into the development and dissemination of astronomy and related disciplines, and we welcome papers exploring similar topics within and across different time periods, geographic regions, and cultural contexts.