The three stars that form Orion's belt are Alnitak, Alnilam, and Mintaka. Their angular separation, meaning how far apart they appear in the sky, is approximately:

* Alnitak to Alnilam: 3.5 degrees

* Alnilam to Mintaka: 3 degrees

So, the total angular length of Orion's belt is roughly 6.5 degrees.

For comparison, the full moon is about 0.5 degrees wide.