Baraccuda said:
But with the acceleration formula that was used, it lands perfectly at the end of the duration, and you can change the duration time to anything and it will land the same. I'm curious as to how it does this / how this works…

Probably it still works by adjusting launch velocity / angle…

Nice. Thanks for reminiscing. Does symplectic order 4 have a nickname too?

All I know is that I simulated the orbit of Mercury around the Sun, using Euler integration, and it was not even close to accurate. Symplectic order 4 did the trick.