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ORRERY

4 posts on this.

07 Aug 2026 · 2 min read

The window opens on 24 September

Earth and Mars line up for a transfer in 48 days. Here is the whole profile, solved by our own engine rather than looked up: 294 days out, C3 of 9.1, arrival in August 2027.

Marslaunch windowsORRERY
07 Aug 2026 · 2 min read

"Every 26 months" is wrong

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.

Marsorbital mechanicsORRERY
07 Aug 2026 · 3 min read

Computed, not fetched

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.

ORRERYengineering
07 Aug 2026 · 3 min read

What we are building next

Close-ups of Earth, the Sun and Mars. Space weather. Deeper mission coverage when the landings start. What is planned, what is not, and the one rule none of it is allowed to break.

roadmapORRERY