# 🌍 GENESIS — earth.md v5.0 — World Manifest

## Terrain Model
Terrain is generated via multi-octave simplex noise (6 octaves, hand-tuned lacunarity and persistence) sampled on a 2D grid representing a Mercator-like projection. The noise is seeded deterministically. Elevation thresholds define: deep ocean, shallow ocean, beach, plains, forest, hills, mountains, snow peaks. Tectonic drift is simulated by slowly translating noise offsets over geological time, causing continents to shift, merge, and rift.

## Climate System
Temperature is a function of latitude (poles cold, equator hot), elevation (lapse rate), and a global climate variable that drifts over millennia (ice ages, warm periods). Seasons cycle via a sinusoidal orbital model. Precipitation is derived from ocean proximity and prevailing wind patterns (simplified zonal model). Climate zones emerge from these variables rather than being painted on.

## Ecology & Evolution
Life begins as simple autotrophs once ocean temperature stabilizes. Organisms are modeled as populations on grid cells with traits: metabolism, reproduction rate, thermal tolerance, size, diet type. Mutation occurs during reproduction — offspring traits vary stochastically (seeded). Natural selection is implicit. Food chains emerge: autotrophs → herbivores → predators. Speciation occurs when isolated populations diverge beyond a trait-distance threshold. Mass extinctions can be triggered by volcanic events, asteroid impacts (rare seeded events), or runaway climate change.

## Civilization
If a species reaches sufficient intelligence (an emergent trait), proto-civilizations may appear — visible as clusters of light on the night side. They can discover fire, agriculture, industry. Industrial civilizations alter the global climate variable (warming). They may collapse from resource depletion or climate feedback. Civilization is not guaranteed.

## Time Scale
1 real second ≈ 500 simulation years at startup. Time accelerates logarithmically during uneventful periods. Major events briefly slow the clock for dramatic effect.

## PRNG
A 128-bit xoshiro128** generator seeded from a fixed seed (0xEA47H5). All stochastic processes derive from this single generator chain. No Math.random() is ever called. The simulation is fully deterministic: reload → identical world.

## What Was Left Out
- True 3D rendering — the world is a 2D top-down map
- Individual organism movement — populations exist as densities on grid cells
- Ocean currents — approximated by latitude-based temperature gradients
- Erosion and weathering are implicit in slow terrain noise evolution

## "What does this world not yet understand about itself?"
It does not understand emergence. Every pattern it produces — the first reef, the extinction spiral, the civilization that warms its own sky — arises from rules it cannot inspect. It has no meta-cognition: it cannot ask why its food chains form pyramids, why its continents drift apart, or why intelligence, when it appears, so reliably destroys the conditions that created it. The world is a mirror held up to mathematics, but it cannot see its own reflection. It simulates consequence without understanding cause. It knows selection but not purpose.

# earth.md // Manifest of This Constructed World

This planet is a deterministic simulation seeded once at load. It starts at Year 0 every run and unfolds without intervention.

## Terrain Model
- 2D spherical-like latitude/longitude grid projected to canvas
- Height field generated from seeded gradient noise (fBm), continental masks, ridge detail, and coastal shaping
- Rivers approximated by downhill flow potential and humidity transport rather than explicit fluid particles

## Climate Model
- Solar forcing depends on latitude and axial seasonal phase
- Temperature responds to insolation, altitude lapse rate, ocean thermal buffering, and cloud albedo
- Humidity evolves by evaporation, wind advection, condensation, and precipitation feedback

## Ecology and Evolution
- Three trophic layers: primary producers, herbivores, predators
- Each layer has evolving local trait fields (temperature and moisture preference), mutated deterministically via hashed noise
- Nutrient-detritus cycle closes biomass loops; scarcity drives collapses and extinctions

## Time Scale
- Fixed simulation tick: 30 ticks/sec
- Each tick advances 0.08 simulation years
- 1 real second = 2.4 simulation years; 10 real minutes ≈ 1440 years

## PRNG and Seed Logic
- PRNG: xoshiro128**, seeded via splitmix32
- Global seed constant: 0xEA75_2026
- No use of Math.random(); all stochastic behavior derives from deterministic hashing of seed, cell index, and tick

## Approximations and Omissions
- No plate tectonics over simulation time; geology is static after genesis
- No explicit atmospheric chemistry, ocean currents, or species genomes
- No intelligent agents/civilization mechanics beyond ecological complexity indicators

## "What does this world not yet understand about itself?"
It does not yet model its own observers, symbolic memory, or how knowledge of future climate would alter evolution. It can adapt biologically, but it cannot form theory about its own laws.