It is important to understand a sun chart and be able to read the information from it because sun charts can be easily generated for any location on the Earth surface. This is an invaluable tool when designing a structure, especially when someone can not observe the site directly
There are websites and programs that provide sun path information and also generate sun charts. Here is link to such a website:
http://solardat.uoregon.edu/SunChartProgram.html
