One simple command can address this question in both Java and Bedrock Edition, and can also operate on multiplayer worlds and on larger-scale servers and realms.

You can get a command block in your Minecraft Java or Bedrock world using cheats and a special chat command.

A guide to using console commands for creating a sphere in Minecraft Java 1.19 The materials The materials needed to use command blocks to make a sphere (Image via Minecraft) ...