Rendering and Illumination - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 329

Note
To orient our scene related to the Sun, it is much better to change North direc-
tion than to rotate the entire scene. When changing North direction , ViewCube
rotates accordingly and its top view is different from the plan view.
The LATITUDE and LONGITUDE variables indicate the current values of latitude
and longitude. The NORTHDIRECTION variable indicates the north direction re-
lated to the Y axis of the world coordinate system.
Exercise 10.2
We will render a 3D model at two different times of the day:
1. We open the drawing A3D_10_02.DWG of a simple house.
2. Applying a render, we will see the model, but only with the default lighting.