velocity3x wrote:The ridge line in the pic is a measured 1,200 yards down range. GB's are still climbing out when they cross the ridge line and disappear on the other side.
I find a claim that a golf ball is "still climbing" at over a kilometre away highly dubious (not that I'm claiming you're intentionally misleading us).
Partly because of the unbelievably insane velocities simply needed to do that, but mostly because human eyesight simply isn't good enough to allow you to even see a golf-ball at those distances.
For a human with a typical eyeball, even with decent eyesight and no visual problem, the mathematical limit on the minimum something can be and still be made out is about ten thousandths of a radian.
Because of the way radians works, this means things have to be closer than roughly ten thousand times their "diameter" in order to be made out, which means that a golf ball can't be made out at a huge amount further than a quarter mile away.
I might believe that someone with notably good eyes might make out one at a bit over half a kilometre, but beyond that, no.
So, if you think you see anything much further away than ten thousand times its "diameter", you're almost certainly mistaken on the distance.
Of course, this throws even more doubt on claims of making out 1/2" projectiles at half a mile. I had to struggle to find 20mm projectiles at 650 metres, and those were painted with glo-paint, not to mention I'd already modelled where I was expecting them to be. (Even then, I lost most of the ones I fired)
This does assume you're using the human eye without magnification. But I find the suggestion that you could track a projectile using binoculars even more laughable - and that's before you even start to suggest you can work out the distance through them.
EDIT: Minor grammatical error.