Pi Day 2017

I know a lot of people who have one or two choice holidays that they seem to celebrate disproportionately compared to the rest. For me, this is March 14th: Pi Day. Don't get me started on how arbitrary it is: base 10, Pi vs Tau, arbitrary calendar, the list of valid complaints could go on for some time. I couldn't care less. It is an excuse to do something vaguely related to math so that's good enough for me! Last year I constructed a Venn Piagram. This year, I went back to my engineering roots. I present to you:

Planetary Pies