"Swingman" wrote in message
...
A "chord", as opposed to the curved part, which is generally called the
"arc".

An old Artilleryman will tell you that one mil of angle will subtend an
"arc" of 1 meter at 1000 meters .. but, as in your case, it is really the
"chord" that is the distance on the ground you're after when adjusting
artillery fire. With the roughly 50 meter effective zone of a HE 105mm
round, the difference between the "chord" and the "arc: is moot ... but
you
need a bit more precision than that.

... I mean, ya gotta put this stuff in perspective with those things of
which you are intimately familiar.


And if the gun was on a ship....... LOL. I don't think I will ever forget
the length of the equation we used in Physics when determining when to pull
the trigger and when will it hit if the seas were rough and the ship was
traveling.