How do I find out the correct North angle value for my EPW?

So I have been going through some example files and I can see that the North angle value has been set to 20 in some cases…

How do I find out which value I need to use in my case/other EPW files?

Hi @ShynnSup,

North angles are for if your Rhino/GH geometry is not built so that the y-axis is north, e.g in Revit terms the project north differs from true north. The north angle let’s you account for this, rather than having to rotate your geometry to so that it is north oriented.