I was testing out the capabilities of an Atomic Bomb, and from the city it was created in, which happened to be equatorial, I appeared to get the full grid available as a target, but after a couple rebases, bringing it up near a couple potential enemies, which happened to put the bomb in a polar region, my target grid was heavily restricted, I could only seem to fire to my North, where the potential enemies were to the southeast and southwest.
Is this somehow related to the globe and lattitude, similar to space launches? Why would it effect an Atomic Bomb, when the delivery system appears to be a bomber?