Public-data portal
A working demonstrator designed to connect public decisions, budgets, indicators and source material in one readable interface.
Explore the portal →Delta-Sierra applications and tools
Calculate, explore, verify
This hub brings together the interactive tools that actually exist on Delta-Sierra: public-data exploration, economic calculators, multi-year budget scenarios and Mars engineering calculators. The point is not to display a magic number, but to let the reader change assumptions and understand what drives the result.
France, economics and public finance
Economics calculators
The French economics school includes calculators and worked examples for orders of magnitude, growth, public finance and sensitivity analysis.
Open the calculators →Multi-year budget simulator
Separate recurring savings from transition costs and examine how a trajectory evolves across several years.
Test a budget path →Mars engineering
Delta-v calculator
Connect mission velocity requirements to the rocket equation and learn what the symbols mean.
Calculate delta-v →Hohmann transfer
Estimate a simplified orbital transfer and see the assumptions behind the result.
Open the calculator →Power and batteries
Relate average demand, solar production, storage duration and design margins.
Test a power scenario →Oxygen demand
Translate human metabolic demand into quantities that can be compared with storage and production systems.
Calculate oxygen demand →Cargo and landings
Explore payload mass, landing cadence and logistics for a growing Mars settlement.
Test logistics →All Mars tools
Browse every public engineering calculator currently connected to the English Mars corpus.
Browse all tools →Reading rule. A calculator output is not a forecast. It is the consequence of assumptions, units and a chosen perimeter. Use the linked lessons to understand the mechanism before treating a number as meaningful.