The Weather Orb is one of the two admin items created by using the Theoretical Elementizer.
The Weather Orb lets you change the current weather. Usage is restricted by an internal cooldown which is shown in the durability bar of the item.
The interesting part about it is the fact, that you do not need admin rights to do those operations.
One of its uses would be maximizing the sun exposure of Solar Generators to produce more energy, as they don't work during rain.
The Weather Orb will not "cooldown" unless it is in your inventory.
It costs one Diamond and one Enriched Alloy