Those who interested in how to go from there to computer algorithm may have a look at http://www.masswerk.at/spacewar/inside/insidespacewar-pt6-gravity.html#squ

Those who interested in how to go from there to computer algorithm may have a look at http://www.masswerk.at/spacewar/inside/insidespacewar-pt6-gravity.html#square_roots http://www.masswerk.at/spacewar/inside/insidespacewar-pt6-gr... This is part of an excursus trying to explain, how basic math was implemented on the DEC PDP-1, namely in Spacewar!, the first digital video game (1961/62). The excursus starts at http://www.masswerk.at/spacewar/inside/insidespacewar-pt6-gravity.html#excursus http://www.masswerk.at/spacewar/inside/insidespacewar-pt6-gr... (there's a tab on the bottom right for an instruction list of the PDP-1, mind that the PDP-1 uses 1's-complement for negative numbers).