UPDATE!!

I looked it up and I was mostly right. This site has a great explanation along with good math to show how to calculate. At 100 yds, 1 MOA accuracy is actually 1.0476 inches. Check it out here: http://www.loadammo.com/Topics/June01.htm. This concept is also responsible for the difference between nautical miles and regular miles. 1.15 nautical miles per 1 regular mile.