The most iconic spaces in Smithsonian’s National Air and Space Museum are the skylit atrium galleries. A significant curatorial challenge is how to protect artifacts from light pouring in through skylights and window walls. A major challenge for the design of the museum’s renovation was how to reduce daylight to acceptable levels. Many options for glazing and shading devices are available, and new computer modeling tools allowed the design team and conservators to evaluate daylight treatments by looking at light levels in specific locations over the course of the day and over the course of the year. These tools can help designers develop shading solutions and help curators strategically place artifacts in three-dimensional space.