News from the deck — notes on SpaceX, Mars and the road out, written alongside the engine that computes it.
The rule of thumb everyone repeats. We measured 116 real oppositions with our own engine and the gaps run from 766 to 804 days — a spread of more than five weeks.
The best day to leave for Mars is 113 days BEFORE the two planets are closest. Every intuition says wait for the short crossing. The mechanics say go early.
Mars Deck makes no network calls to draw the map. Every position is solved from orbital mechanics on your own device — which is why it loads instantly, works offline, and cannot be switched off by anyone else.