I was putting up the christmas tree this evening and (surprise) all of last year’s light strands worked. However, when I string the lights each year, I realize that I have to continually readjust them until M approves of the light distribution. I thought, “self, there must be some calculus that could help me solve this problem”. So I did the geekiest thing I’ve ever done in my life… I built a “Christmas Light Calculator“. It’s based on Ken Muldrew’s Christmas Tree Calculator. Is the math correct? I don’t know, but 83.5156′ of lights sure seems like a lot!