I was not sure whether to write it in the forum or not, but I decided to write it anyway, since it is only a confirmation.
I also confirmed the following.
When using the Sun Study Extension in Omniverse Create, the “North Orientation” is specified in the “Sun Study Location”.
Am I correct in understanding that when “North Orientation = 0.0”, the +X direction is north?
Similarly, if “North Orientation = 90.0”, is it correct that the -Z direction is north?
I thought it would be good to have information in the documentation on which way is north for each coordinate system (Omniverse Create is Y-Up and right hand).