World Spawn Finder
Edition
Version
Seed
The game searches for the best climate near 0, 0 and then walks a few chunks to find grass to stand on. The map does the search exactly; the last walk needs 3D terrain, so it is within about eighty blocks.
On Java Edition, type /seed in chat (it needs cheats on, or operator rights on a server). On Bedrock, open the world's settings: the seed is listed under Game.