Tool to find the point on the other side of the Earth (Antipodal Coordinates). Two points are said to the antipodes if they are diametrically opposite on a sphere.
Antipodal Coordinates - dCode
Tag(s) : Geography
dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!
A suggestion ? a feedback ? a bug ? an idea ? Write to dCode!
Antipodal Coordinates
Antipode Calculator
Answers to Questions (FAQ)
What is an antipodal point? (Definition)
Two points are called antipodal if they are at two opposite points on a circle or a sphere. They are also said to be diametrically opposed or that they are the most distant points of each other on a spheroid.
Example: On Earth, the north pole and the south pole are antipodes.
Here is an image presenting the earth globe with the continents presented once in yellow, and a second time in blue but with their antipodal coordinates (source wikipedia).
The portions where the yellow and blue continents overlap, are locations on Earth, where digging a rectilinear hole, perpendicular to the ground and passing through the center of the earth would land on another continent.
Example: The antipodes of France is near New-Zealand.
How to calculate antipode?
From the coordinates on a sphere, take the opposite value of the latitude (which is to put or remove a minus sign -), and remove or add 180 to the longitude (to keep it in the interval [-180; +180]) for GPS coordinates.
Example: The $ -12.345, 67.890 $ coordinates have for antipode $ 12.345, -112.11 $
From 3D Cartesian coordinates, take the opposite of each component (x, y, z) ie (-x, -y, -z)
The Earth is assimilated to a sphere, but in practice a more accurate model would be a spheroid (normal ellipsoid) or a geoid.
Source code
dCode retains ownership of the "Antipodal Coordinates" source code. Except explicit open source licence (indicated Creative Commons / free), the "Antipodal Coordinates" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Antipodal Coordinates" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Antipodal Coordinates" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
Reminder : dCode is free to use.
Cite dCode
The copy-paste of the page "Antipodal Coordinates" or any of its results, is allowed (even for commercial purposes) as long as you cite dCode!
Exporting results as a .csv or .txt file is free by clicking on the export icon
Cite as source (bibliography):
Antipodal Coordinates on dCode.fr [online website], retrieved on 2023-09-21,
