That's a great way to get rid of sun interference. I love simple solutions like that. Already has me thinking about a method to do that with my cheapo Chrony unit. There are times of the day, at the local range, where I'm plagued by errors that seem to be sun position related. Tried marking my bullets with a Sharpie, but to no avail.
In Theory, there is no difference between theory and practice. In Practice, there is.