Earth Distances:
• Earth radius: ~6.37 Mm (6,370 km)
• Earth diameter: ~12.74 Mm (12,740 km)
• Earth circumference: ~40.08 Mm (40,080 km)
• Continental distance: 1-20 Mm
Astronomical Distances:
• Moon distance: ~384.4 Mm (384,400 km)
• Sun distance: ~149,600 Mm (149.6 million km)
• Mars (closest): ~54,600 Mm
• Venus (closest): ~25,000 Mm
Transportation & Infrastructure:
• Trans-continental railways: 5-10 Mm
• Ocean cables: 10-25 Mm
• Flight routes: 1-20 Mm
• Satellite orbits: 0.2-36 Mm altitude