Behind luna, halfway around her from an imminently devastating explosion.
I just had a disturbing thought...
Depending on how the shields fail, the explosion could be very tightly focused. Like, a lance of pure annihilation could split luna like a rotten apple
Hiding behind luna wouldn't do us much good, in that case.
Odds are we'll be just fine here, though.
On the far side of jupiter, halfway across the solar system...