Sunlight provides a natural, renewable source of (effectively) parallel lines. In this talk, I discuss a collection of problems and a set of activities that use sunlight to engage students in geometry and trigonometry. The collection of problems was inspired by the history of nautical science and reclaims, for geometry, topics that are typically encountered in Earth science or social studies courses, e.g., the seasons, latitude/longitude. The set of activities concerns a geometric definition of multiplication and the realization of that definition in a physical tool. I consider how sunlight provides a contextualization for geometry that is relevant to and accessible by all learners.