Biological systems have adapted over billions of years to the cycles of day and night. Humans, over the eons, have maintained a critical relationship with the cosmos. Electric lighting (Artificial Light at Night or ALAN) has disrupted these delicate balances, creating an epidemic of light pollution and squelching the darkness. Through this class we will explore the impacts of site lighting on the night sky, and ways to design exterior and site lighting that minimize these impacts. Through high-level discourse, practical considerations and design strategies, as well as a review of the light pollution legislation and sustainable rating system credits, this course will provide students with a grounding in sensitive approaches to electric lighting in the outdoor nighttime. This course is for architecture, landscape architecture, and urban design students, with coursework tailored to each student’s intended focus. While not a prerequisite, Modeling Light serves as a grounding in general concepts in architectural lighting design.