The sun would be the most obvious choice for such a reference point, though it’d be amusing to make it Greenwich and therefore make everyone deal with Earth’s rotation and orbit if they want extremely precise calculations (though I expect there wouldn’t really be a practical difference on that scale).
The bees would still overcome the wasp, assuming it’s a large hive. The wasp will have practical limitations on the amount of ammunition for the weapon (also the question of whether it can reload before getting swarmed) and the ceramic armour won’t help against the bees massing together to form a ball of bees around the wasp and overheating it until it dies.
Edit: Apparently it depends on the type of bees as to whether they do the heat ball of death thing, so your mileage may vary.