# Project Structure
Structure map for the Titanias crate.
```text
Titanias/
├── README.md # Project overview and usage
├── LICENSE # MIT license
├── ChangeLog.md # Version history
├── ComingSoon.md # Planned features
├── Contributing # Contribution guidelines
├── lastest_versions.sh # Restore wildcard dependency versions
│
├── src/
│ ├── main.rs # Entry point — Titania diagnostics: orbit, tectonics, Messina Chasmata
│ ├── lib.rs # Library root, TITANIAMASS (3.53e21 kg), radius 788 km, constants
│ │
│ ├── environment/ # Surface environment
│ │ ├── mod.rs # Exports dust, radiation, thermal
│ │ ├── dust.rs # Impact-generated regolith, irradiation-darkened ice grains
│ │ ├── radiation.rs # Uranian magnetosphere exposure, moderate charged-particle sputtering
│ │ └── thermal.rs # Surface ~70–80 K, minimal diurnal variation, extreme cold
│ │
│ ├── exosphere/ # Tenuous atmosphere
│ │ ├── mod.rs # Exports charging, escape, species
│ │ ├── charging.rs # Uranian magnetosphere plasma interaction, surface sputtering
│ │ ├── escape.rs # Moderate gravity (0.367 m/s²), possible seasonal CO₂ sublimation
│ │ └── species.rs # Possible thin CO₂ atmosphere (seasonal), radiolytic production
│ │
│ ├── geodata/ # Geographic reference data
│ │ ├── mod.rs # Exports coordinates, elevation, landing_sites, regions
│ │ ├── coordinates.rs # Planetocentric lat/lon, IAU Titania-fixed frame
│ │ ├── elevation.rs # Voyager 2 limb profiles, limited southern hemisphere coverage
│ │ ├── landing_sites.rs # Candidate sites on smooth inter-crater plains, tectonic graben floors
│ │ └── regions.rs # Messina Chasmata, Gertrude crater, Ursula crater, smooth plains
│ │
│ ├── geology/ # Surface and interior geology
│ │ ├── mod.rs # Exports craters, erosion, mountains, regolith, volcanism
│ │ ├── craters.rs # Gertrude (326 km), Ursula (135 km), moderate crater density
│ │ ├── erosion.rs # Irradiation darkening, viscous relaxation of ancient features
│ │ ├── mountains.rs # Graben-bounding normal fault scarps, Messina Chasmata walls
│ │ ├── regolith.rs # Dark irradiated ice-rock regolith, moderate thickness
│ │ └── volcanism.rs # Ancient cryovolcanic resurfacing — smooth plains between craters
│ │
│ ├── interactions/ # Gravitational interactions
│ │ ├── mod.rs # Exports earth_tides, uranuss, orbital_dynamics
│ │ ├── earth_tides.rs # Earth–Titania perturbation (negligible at 19.2 AU)
│ │ ├── uranuss.rs # Uranus gravitational influence, largest Uranian moon at 436 300 km
│ │ └── orbital_dynamics.rs # Near-circular prograde orbit, possible past resonance with Umbriel
│ │
│ ├── lighting/ # Illumination model
│ │ ├── mod.rs # Exports eclipses, uranusshine, solar_position
│ │ ├── eclipses.rs # Uranus shadow transits, equinoctial mutual events (every 42 yr)
│ │ ├── uranusshine.rs # Reflected Uranian light on night side, faint at 19.2 AU
│ │ └── solar_position.rs # Solar zenith angle, 8.71 d orbital period, extreme axial tilt (98°)
│ │
│ ├── missions/ # Exploration missions
│ │ ├── mod.rs # Exports landers, orbiters, relay
│ │ ├── landers.rs # Future Uranus system lander concepts, tectonic terrain access
│ │ ├── orbiters.rs # Voyager 2 flyby (1986, only close-up data), Uranus Orbiter priority
│ │ └── relay.rs # Communication relay via Uranus orbit, extreme distance link
│ │
│ ├── observation/ # Remote observation
│ │ ├── mod.rs # Exports communications, uranus_view, navigation
│ │ ├── communications.rs # Deep-space link budget, 19.2 AU light-time delay (~160 min)
│ │ ├── uranus_view.rs # Uranus apparent size from Titania (~5°), ring system edge-on view
│ │ └── navigation.rs # Orbital navigation, limited gravity field knowledge
│ │
│ ├── physics/ # Orbital and impact mechanics
│ │ ├── mod.rs # Exports collisions, orbit, rotation, tides
│ │ ├── collisions.rs # Impact flux at 19.2 AU, heliocentric + planetocentric impactors
│ │ ├── orbit.rs # a = 436 300 km, e = 0.0011, period 8.71 d, vis-viva
│ │ ├── rotation.rs # Synchronous rotation, period = orbital period
│ │ └── tides.rs # Low tidal heating, possible past resonance-driven activity
│ │
│ ├── rendering/ # Visual rendering pipeline
│ │ ├── mod.rs # Exports dust, materials, shaders
│ │ ├── dust.rs # Dark irradiated regolith rendering, moderate albedo (0.27)
│ │ ├── lod.rs # Pixel-precise adaptive LOD
│ │ ├── materials.rs # PBR ice-rock mixture, CO₂/H₂O ice spectral features
│ │ ├── mesh.rs # Icosphere subdivision, vertex data
│ │ └── shaders.rs # GPU shader programs — tectonic graben, cratered terrain
│ │
│ ├── resources/ # Extractable resources
│ │ ├── mod.rs # Exports minerals, regolith, water_ice
│ │ ├── minerals.rs # Silicate rock component (~50%), carbonaceous material
│ │ ├── regolith.rs # Ice-rock regolith, irradiation-processed surface layer
│ │ └── water_ice.rs # Water ice surface, possible subsurface ammonia-water ocean
│ │
│ ├── surface/ # Surface mapping
│ │ ├── mod.rs # Exports heightmaps, mapping, zones
│ │ ├── heightmaps.rs # Voyager 2 limb-derived topography, southern hemisphere bias
│ │ ├── mapping.rs # Crater maps, fault maps, Messina Chasmata extent
│ │ └── zones.rs # Cratered terrain, Messina graben system, smooth resurfaced plains
│ │
│ ├── temporal/ # Time systems
│ │ ├── mod.rs # Exports calendar, epoch, time_scale
│ │ ├── calendar.rs # Titania calendar — 8.71 d orbital period, Uranus year (84 yr)
│ │ ├── epoch.rs # J2000 epoch, Voyager 2 encounter date (1986-01-24)
│ │ └── time_scale.rs # TDB/UT1/TAI conversions at 19.2 AU light-time delay
│ │
│ └── terrain/ # Terrain mesh generation
│ ├── mod.rs # Exports lod, mesh, texturing
│ ├── lod.rs # Level-of-detail streaming for tectonic faults and cratered terrain
│ ├── mesh.rs # Spherical mesh, radius 788 km (largest Uranian moon)
│ └── texturing.rs # Voyager 2 imagery drape, partial coverage southern hemisphere
│
├── tests/ # Integration tests
│ ├── environment_tests.rs # Tests extreme cold (~75 K), radiation sputtering, regolith darkening
│ ├── exosphere_tests.rs # Tests CO₂ seasonal atmosphere, sublimation rate estimates
│ ├── geodata_tests.rs # Tests coordinate transforms, Messina Chasmata location
│ ├── geology_tests.rs # Tests Gertrude basin, Messina graben mechanics, surface age
│ ├── interactions_tests.rs # Tests Uranus perturbation, past resonance scenarios
│ ├── lighting_tests.rs # Tests equinoctial eclipse timing, uranusshine intensity
│ ├── missions_tests.rs # Tests Voyager 2 flyby parameters, Uranus Orbiter concepts
│ ├── observation_tests.rs # Tests link budget at 19.2 AU, Uranus apparent diameter
│ ├── physics_tests.rs # Tests orbital period, synchronous rotation, tidal stress
│ ├── rendering_tests.rs # Tests surface albedo (0.27), ice-rock material properties
│ ├── resources_tests.rs # Tests water ice fraction, subsurface ocean viability
│ ├── surface_tests.rs # Tests Voyager coverage limits, fault system mapping
│ ├── temporal_tests.rs # Tests epoch conversions, Uranus year period
│ └── terrain_tests.rs # Tests mesh accuracy, LOD transitions at graben boundaries
│
└── examples/ # Runnable examples
├── check_landing_site.rs # Evaluate smooth plains near Messina Chasmata for landing
├── crater_sim.rs # Gertrude/Ursula basin formation in ice-rock crust
├── eclipse_sim.rs # Uranus shadow transit, equinoctial mutual event timing
├── exosphere_sim.rs # Seasonal CO₂ sublimation atmosphere modeling
├── uranus_observation.rs # Uranus as seen from Titania — tilted disk, ring system
├── orbital_sim.rs # 8.71-day orbit propagation, long-term stability analysis
├── radiation_sim.rs # Uranian magnetosphere environment at Titania orbit
├── resource_survey.rs # Water ice and silicate composition mapping
└── tidal_effects.rs # Past resonance tidal heating — Messina Chasmata formation
```