gen-briefly-explain-the-great-circle-distance-and-one-common-mis-fd22

Briefly explain the great-circle distance and one common misconception about it.

## Great-Circle Distance **Great-circle distance** is the shortest path between two points on the surface of a sphere, measured along the sphere's surface. This path follows a "great circle"—a circle whose center coincides with the sphere's center (like the equator or lines of longitude). It's crucial for navigation and aviation since Earth is approximately spherical. ## Common Misconception Many people assume that traveling east-west at constant latitude gives the shortest distance between two points. **This is false** (except along the equator). For example, a flight from New York to Tokyo actually routes far north over Alaska, not directly west across the Pacific at constant latitude. The great-circle path appears curved on flat maps due to projection distortion, but it's actually the shortest route on the globe.