I have seen an article online that explains it better than I evidently can (although I'm also having to work against people that think they know they are right when they are not, simply because they believed incorrect information for so long) and I'm trying to find it.
The first crossing of a projectile and line of sight is called the "initial intersection". It then reaches maximum ordinate above line of sight before it starts on it's way back down, where it passes the line of sight at the "second intersection" or "final intersection". It is this second intersection that we call zero.



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