Aegis MOS

Aegis MOS runs a continuous digital twin of a spacecraft, detects and explains anomalies, schedules mission activities under real constraints, and lets operators draft and approve procedure steps - with every irreversible action passing through an explicit authority and verification gate. The design holds to four principles: a single writer, where only the simulator mutates spacecraft state; deterministic timing, with faults keyed to simulation time rather than wall-clock; byte-identical broadcast, so every WebSocket client receives the same serialised payload per tick; and the authority gate, under which no irreversible command is approved without human review and an HMAC seal. The stack is Python 3.11 and FastAPI with a Node.js front end and PostgreSQL, deployable via Docker Compose, and ships with product and technical requirements documents.