AHOY, link this link is to an article on the Knights Armaments M110 iPod Touch mount and accompanying ballistics software. On the Fire arms blog. Neatest thing you ever saw.
Public service announcement brought to you by Newjarheaddean; Now here this, there has been a major shift in the earth’s axial the electromagnetic fields are chaotic all electronics are trash. This message is being shouted not transmitted.

NOW HOW LONG DO ANY OF YOU THINK IT WELL BE BEFORE THE FALLOWING IS A BLACK ART?
Excerpt from internet; (Note: this paper deals with the math behind mils, moa, and their distance equations.)

A “mil” in “shooters” terminology is short for “milliradian”, a real trigonometric unit of angular measurement of a circle. Every circle has 6283.2 milliradians, which are small angles, in it (we’ll discuss the origins of this number later). A mil is finer in measurement than degrees, thus more precise (6283.2 mils in a circle vs. 360 degrees in a circle). In shooting, we use mils to find the distance to targets, which we need to know, in order to adjust our shots. It’s also used to adjust shots for winds and/or the movements of targets.
There is some controversy out there about what type of “mils” American military and tactical shooters use. Some think they use a mil that is based on a circle that has 6400 mils in it instead of 6283.2. This has widely been circulated, written about and even taught, including in the military. But this is not the case. While it may be true that some Artillery and other military units do use this type of mil (the one based on 6400), American military snipers and tactical shooters use scopes that are based on and calibrated using “real mathematical milliradians”, which are 6283.2 milliradians (mils) per circle. (Note: Some other countries, like Russia for example, do use different types of mils for their scopes, but for American shooters, our “mil” is 6283.2 milliradians per circle).
What is a minute of angle (moa)? Like the “mil”, it is an actual “true” unit of angular measurement, and is used quite often in shooting (I will abbreviate this “true” moa angular measurement as just “moa”). It is even more precise than a mil (21,600 minutes in a circle vs. 6283.2 mils). Many scopes use reticles etched in mils to find the range to the target, but have their knob adjustments in “minutes of angle” (moa). Many times we also talk about our shot “groupings” in moa. Furthermore, some scopes like mine have their reticles etched in minutes of angle (moa) rather than in “mils”.
There is another slightly different “moa” that we will discuss that some shooters use and that some rifle scopes are calibrated in. It is close to the actual “true” moa but not equal to it. It is referred to as “inch per 100 yards” (IPHY) or “shooters moa” (s-moa). (Because “shooters moa” (s-moa) is easier to say than “IPHY”, I will mostly use that terminology in this paper).
Before we can proceed with the math behind mils, moa and their distance equations, we need to define a few terms and establish a few relations. So just follow along, hang in there, and you will see why we will need these later.
Radians
What is a radian? (Warning: you might have to read this paragraph a few times). A “radian” is a unit of angular measurement. Officially, one radian subtends an arc equal in length to the radius (r) of a circle. (Yeah that helps). How about this? A radian associates an arc length, called a “radian arc”, which is equal in length to the radius of the circle, with an angle at the center of the circle. The angle the arc creates is called a “radian”. Or simply, think of it as a piece of apple pie, where the two sides of the pie (the radii) are each equal in length to the curvature part of the pie (the arc). The angle created by the three sides at the center of the circle equals 1 radian (Fig.1).

G-day!

Yeah Whatever.