Sol Four
Pre-departure

Sol 3 from the Sun is taken. Sol 4 is the next horizon.

We are Martians.
We just haven't moved back yet.

Sol Four is a pre-departure company: two disciplines quietly rehearsing on Earth for an AI-directed colony: machines that farm with no GPS and no one watching, and analysts who read the language of the Martian environment.

One-way light time, Earth → Mars
Calculating...
latency of every future standup meeting
Current distance to the office
Calculating...
approx. · circular-orbit model
Departure window
T−TBD
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Two divisions · one destination

An AI-directed colony still has two supply chains that don't fit on a rocket: food and information.

Division 01: Autonomous Systems

No GPS. No driver. No problem.

GPS-denied agricultural autonomy: machines that localize by what they can see and touch, plan their own work, and take direction from a governing intelligence rather than a joystick. Mars has no satellite constellation overhead. Our machines never assume one.

On Earth GPS-denied agricultural autonomy: perception-based localization, self-planned field work, all-day unattended operation.
On Mars Greenhouse agriculture and regolith handling under AI direction, executing through the light delay instead of waiting on Earth for orders.
Division 02: Language & Signals

Every colony runs on information.

Open-source intelligence specialists who read the world's signals for a living and are studying a new one: the language of the Martian environment. Dust, pressure, radiation, telemetry. The planet is always saying something, and the colony's directing AI needs fluent listeners.

On Earth OSINT research and signal triage across open sources: the craft of turning noisy streams into ground truth.
On Mars Translating the Martian environment (weather, dust, radiation, machine telemetry) into intelligence the colony's AI can act on.

The thinking behind the mission

Mars won't be settled by rockets alone. Rockets solve arrival. Staying is solved by the boring industries: growing food, moving material, keeping machines alive. It will be an AI that directs them, minute to minute, across an interplanetary delay. Humans set intent. The colony executes.

So we practice on the third rock. Every field our machines finish with no GPS and no human, every noisy signal our analysts turn into ground truth, is a rehearsal for machines that take direction from an intelligence instead of a driver. When the departure window opens, we don't want to be learning. We want to be packing.

Our work on Earth follows one pre-departure policy: nothing blocks the return.