The Solar Radiation feature depends on the geographic location and weather station specified for the project. This can be set using the Location Weather and Site dialog. Click Analyze tab Project Location panel Location. You can also access this dialog from the Sun Settings dialog and the ViewCube Set Location drop-down. You must be signed in to Autodesk Online Services to access the Location Weather and Site dialog.
You can define Location using an Internet Mapping Service. The Project Address can be entered as a place name or more accurately as a Latitude and Longitude, if it is known. The eight closest weather stations are listed.