a scaled model on top whereas the table lies stationary with only sun lamps in motion. The heliodon consists of a horizontal platform and seven rings that represent the sun path for the 21st day of every month which can be rotated to replicate the time of the day. It acts as a teaching tool for architects, planners, and developers. The heliodon can be used to teach solar geometry and solar responsive design principles in science museums. Without reliance on external sky conditions, it is simple to evaluate sun shading analysis at any latitude. This type of heliodon is very intuitive to adjust and operate. This heliodon requires only limited training since it is easy to understand and operate. Considering the characteristics, the manual sun emulator is also excellent for explaining solar dynamics and cardinal points to children in a function, scientific and fun way of demonstration. Manual sun emulator heliodon is used in various universities such as: Auburn University, Alabama - The university uses a 48” (1.2m) diameter Formica covered sun emulator heliodon known as HPD Model 126 Heliodon. Texas Christian University, Texas – The students at the university use sun emulator heliodon for daylight studies in lighting design projects. Southeastern Louisiana University, Louisiana – The university uses heliodon as an interactive tool for teaching purposes in designing solar aware architecture. Durham School of Engineering and Construction, Nebraska – Prof. Norbert Lechner uses sun emulator heliodon to explain sun shading analysis of scale model. CERES Center at Ball State University, Indiana Judson College, Alabama Robotic Heliodon with Fixed Light Source This type of robotic heliodons is the most accurate sun simulator. It is used to evaluate scale models in a compact space with a fixed light source with the support of a robotic platform. It is an automatically operated heliodon in which a physical model is accurately positioned with the help of computers around two axes. The robotic heliodon can process frequent tests and evaluations on bigger and heavier models than the manual ones to produce precise results for experiments. They are used for daylighting studies in universities, research facilities and development laboratories for sustainable building designs. Some robotic heliodons use a mirror to fold the light path and allow the installation in a small room. The room is normally kept dark without windows and the walls, ceilings and floors are usually in black. Robotic Heliodon is used in