Premium topic
Geodesy
Coordinate system on a sphere, the Haversine great-circle distance, and basic satellite geometry.
Worked Example
Distance NYC ↔ London (rough)
Given: Δ ≈ central angle 0.873 rad
- 1
Arc length
s = 6371 · 0.873
Worked Example
1° latitude in km
Given: Full circle = 360°
- 1
Circumference
2π·6371 ≈ 40030 km
Timed Game · 6 problems
02:00
Answer 6 problems in 2 min. Timer auto-stops.