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Distance Between Coordinates Calculator

Calculate the shortest spherical surface path between two decimal latitude and longitude points using the haversine form of the great-circle equation. GeoMiner returns distance in metres, kilometres, international miles, and nautical miles; the central angle; the initial departure bearing; final arrival bearing; and the great-circle midpoint. Coordinates and calculated values remain in the browser. Analytics retain only bounded action, broad distance-band, and bearing-status groups—never latitude, longitude, distance, bearing, midpoint, route, project, station, or notes. The calculation normalizes longitude differences so points immediately across +180 and −180 degrees follow the ordinary short antimeridian arc. Coincident points have zero distance but no travel direction. Exact antipodal points have infinitely many equal great-circle paths, so a unique bearing and midpoint do not exist. The tool uses a conventional mean Earth radius of 6,371.0088 kilometres. Real Earth geometry is ellipsoidal and irregular; an authoritative ellipsoidal inverse calculation can produce a different distance and azimuth. The initial bearing is tangent to the great-circle path at departure and the final bearing is tangent on arrival. They can differ because a great-circle course usually changes relative to meridians. A rhumb line holds constant compass bearing but generally is not the shortest spherical path. A projected map can make both paths look misleading because no flat projection preserves all distance, direction, area, and shape. This result excludes elevation, terrain, datum transformation, coordinate uncertainty, source accuracy, plate motion, projection scale, three-dimensional geometry, roads, trails, claim or property lines, obstacles, weather, hazards, and operational routing. Do not use it to establish boundaries, claims, survey control, engineering geometry, aviation or marine routing, emergency response, legal location, or safety-critical navigation. Preserve the coordinate source, order, sign convention, datum and realization, epoch, precision, collection method, uncertainty, calculation model, units, and intended use. Consequential work requires current authoritative control, suitable datum transformations, ellipsoidal geodesy, applicable standards, and qualified review.

Verification resources

Cross-check terminology, classification, methods, and safety with these authoritative external resources.

  • undefined. Documents great-circle distance and azimuth equations, including the haversine form used for stable spherical angular distance.
  • undefined. Explains that the shortest path between two points on a sphere follows a great circle.
  • undefined. Lists Earth's approximate mean radius as 6,371 kilometres.
  • undefined. Provides a reference Earth mean radius near 6,371.008 kilometres for a spherical approximation.
  • undefined. Describes ellipsoidal geodetic inverse calculations for azimuth and distance, the appropriate higher-precision alternative to a mean-radius sphere.

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Common questions

How do I calculate distance between two latitude and longitude points?
Calculate the central angle with the haversine equation and multiply it by the chosen Earth radius. GeoMiner performs this mean-radius spherical calculation locally in the browser.
Is great-circle distance the same as driving, walking, or map distance?
No. It is the shortest surface path on a spherical model and does not follow roads, trails, property lines, terrain, obstacles, or a projected-map grid.
What are initial and final bearings?
They are the tangent directions on departure and arrival along the great-circle path. They can differ because the path curves relative to latitude and longitude lines.
Why can bearings be undefined?
Coincident points have no travel direction. Exact antipodes have infinitely many equal great-circle paths, so no unique bearing or midpoint exists.
Is this accurate enough for surveying or navigation?
No. It omits ellipsoidal geodesy, elevation, datum transformation, uncertainty, routes, obstacles, and operational hazards. Use an authoritative workflow for consequential decisions.

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