Constitutionality of National Day of Prayer?

Actually, my theory has gotten even more bizarre lately. I think it's actually like a sine wave with waves in it. The "waves in the wave" would be the period between each wave (which gets longer and longer over time, and then shorter and shorter over time) and the amplitude from one wave to the next (which gets bigger and bigger over time and then smaller and smaller over time.) I haven't thought it out much past that though, because I think it will most likely end up being an infinitely complex wave which kinda becomes pointless to talk about.