How to Make a Dome or Circle in Minecraft
This weekend, I started a new Minecraft build that I wanted to be spherical in shape. Of course, creating a sphere out of square blocks is easier said than done. Architecturally, I knew how to make it work, but my geometry skills are a little rusty, and I couldn't get the dimensions quite right. After struggling on my own for a little while, I decided to go to the internet for help.
Of all the 'how to' guides I found, this one is definitely the best. This video shows you how to build a dome in Minecraft. If you want to build a complete sphere, you can definitely do that as well -- the principle is the same.