Shoot the moon in half because its gonna fall into Earth. As an Astronomer, I can say that unless another celestial body of equal size or with sufficient inertia hit the moon, it would take until the 3400s for the moon to hit the Earth. And long before then, we will have perfected space flight and stabilized the moons orbit so we could terraform it.
As for the cannons though, they are awesome. And I agree with everyone else: Chinnoks, really?
If this universe has mastered space travel then why didn't Earth just build space based weapons? They'd be easier to position than waiting for the guns on the ground and the moon to align. But still I can't not say this piece is amazing. And yet those 20th century Chinooks.
Awesome guns. By the way most people assume that those guns shoot projectiles. Its the future? they could be giant Particle accelerators, laser cannons or even ray cannons. Anyway I do see however firing a weapon like that in earths atmosphere without the right kind containment field could destroy the ozone layer or worse.
However, why are you using Chinook helicopters? It does not fit the setting at all, I think you should design some kind of futuristic transport aircraft, looking at your other works, it should look incredible.
CH-47s were introduced in 1962 and the first ones (after upgrades) are still in active service, the last variant (CH-47F) rolled out of the production line in 2006. It's a great helicopter with a great design, so hey, who knows. Also, Kawasaki has a license to produce them (as variant J), so that places them in Japan with local production.
Funny that people are pointing out that the Chinooks would be obsolete in the time of Neo Japan. Anachronism is quite common in scifi - easiest examples I can think of are firearms in movies and anime - which commonly feature guns from the 20th century despite advanced starship technology, colonization, and cybernetics.
If this thing actually broke the moon in half (Which I m going to ignore the fact it would merge back together due to gravity) the amount of debris is going to be astronomical, and I really doubt such a massive gun can be fired that quickly to deal with all of the rocks that got loosen up. Even if we assume more batteries around the world to safeguard America, Europe/Africa, and such.
Think of this as an exponentially worse scenario of why no scientist suggest blowing up asteroids with nukes unless there is absolutely no other way (And even then its debatable), you destroy one rock, but get many more, which would only work if the smaller ones are small enough to burn in entry. If not, a rock that could have hit a single city you could have evacuated now is five rocks which impact USA, Russia, China, Europe, and Japan. World Wars have started for much less than that. Look at the picture's background, you can see the moon, and chunks the size of countries flying away. The guns would likely take out those first, while smaller but still devastating ones get past. To say notihng of the fact those cannons do not seem to be mounted on turrets, so no adjusting angle of shot, nor turning around.
All things considered, Earth was screwed one way or the other. (But its fiction, so we can ignore this type of problems, of course)
man you think about it too much with our shortview...its year 2200 and they used it as working solution....so those guns must be very advanced technology beyond our cababilites...mby it can shoot energy/heat..with HI energy beam, big rocks will will separate tought heat-material expansion while smaller will just vaporize if some advanced targeting device will calculate all pieces and beam trajectory to hit them all it can be possible...ofcourse now we got no tech to do this but after 200years with some revolotion revolution invention...
anyway with asteroids it seems to be much easier push them in safe trajectory instead of blowing them into safe pieces, i mean "the nuke it" solution...when nuke hit the ground it act like any other explosives....energy spreads around the ground -not tought the ground...so when you hit big object most of energy will go in oposite direction of nuke projectile spliting out just lot of small pieces...so when we hitting asteroids with nukes its more about push them in safe trajectory then really hurt them to pieces....