I\'m almost positive this has been answered already; however, unable to find it since XY coordinates are overloaded due to their relative definition.
What I am tryi
This operation is called "projection." You need to know the identity of the coordinate system you want to project into. There is a lot of arcane lore here.
See this.
https://gis.stackexchange.com/questions/11560/convert-latitude-and-longitude-into-northings-and-eastings