Calculation of the distance (km, meters, mile, foot) between two point in the earth, is possible calcolate the bearing angle between the points and the destination point with start point, distance and bearing.

---

[-]deg.dddddd , [-]deg.dddddd     coordinate 41° 53´ 25.008" N 12° 29´ 32.928" E
[-]deg.dddddd , [-]deg.dddddd     coordinate B 40° 46´ 4.8" N 73° 57´ 57.6" W
distance	km mi
bearing	° degrees

---

---

Contents

  Format

  Accuracy map

  Comment

back to Top     Contents

---

Format

Value range

   Valid value for the latitude are from -90.0° to 90.0° for the longitude are from -180.0° to 180.0°, the + sign should be omitted, while the minus sign is not necessary if there is a radio component to select the direction N-S or W-E (Degree and Decimal format).

Decimal

   You have to select a direction (N-S or W-E) and insert a number from 0 to 90 for the latitude or from 0 to 180 for the longitude (example 45.12345).

Degree

   Degree format is conposed of direction (N-S or W-E) and three sets of numbers separate by the symbols for degrees (°), minutes (’), and seconds (").
   Degree is a integer value without sign, from 0 to 90 for the latitude or from 0 to 180 for the longitude. Minute is a integer value without sign, from 0 to 59. Seconds is a double value without sign, from 0 (or 0.0000) to 59.9999 .

Coordinates

   Coordinates format is the pair of latitude and longitude, with sign minus (-) for the direction south latitude and west longitude separate by comma simbol (,), here some example:
     52.5163 , 13.3779
     40.7682 , -73.9816
     -22.9708 , -43.1830

Search on map

   Click on search to open the webpage Earth Coordinate, here you obtain the latitude and longitude simply by clicking on the map, and save the value by the button save.

back to Top     Contents

---

Accuracy map

The mathematical model used approximates the earth to a sphere with a radius of 6378137 meters, so the calculation of distance might have an error of 0.3%, particularly in the polar extremes, and for long distances through various parallel.
The spherical model also affects the calculation of the bearing or direction (the error increases with distance). If we take the extreme case, consider two diametrically opposite points on the equator the shortest path does not pass through the equator but to the pole, then the bearing will not be 90° or 270° (depending on the direction of travel) but 0° or 180°, for all other cases we will have intermediate values.
If the measure of direction was made a map a plane we will have the same problem.
For short distances the error becomes irrelevant.

back to Top     Contents

---

Comment

If detected inaccuracies bug, want to suggest new features or simply express your opinion of the site web add a comment.
Thanks in advance for your contribution to improve this site.

---

Email (optional)
Comment (required)       (use English or Italian)
Validation code (required)

back to Top     Contents

---