The Render tab on the ribbon is the easiest way to access the sun's settings

1. Default Lighting: turned off when rendering to prevent affecting sunlight and shadows
2. Sun Properties: palette on and off
3. Sun Status: on and off
4. Location: geographic location of the scene and the north direction of the model
5. Sun Date: day of the year for calculating sun position
6. Sun Time: time of day for calculating sun position