You can even set the NPF calculator to accurate, which will ensure that even for larger prints the stars will appear as points.
This sounds complicated and if it wasn’t for apps like PhotoPills it might become quite a hassle to calculate the correct exposure time. With PhotoPills though, you quickly get both the shutter speed calculated with the 500 rule and the NPF rule. You can even set the NPF calculator to accurate, which will ensure that even for larger prints the stars will appear as points.