![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Orthogonality_and_rotation.svg/640px-Orthogonality_and_rotation.svg.png&w=640&q=50)
Hyperbolic orthogonality
Relation of space and time in relativity theory / From Wikipedia, the free encyclopedia
In geometry, the relation of hyperbolic orthogonality between two lines separated by the asymptotes of a hyperbola is a concept used in special relativity to define simultaneous events. Two events will be simultaneous when they are on a line hyperbolically orthogonal to a particular time line. This dependence on a certain time line is determined by velocity, and is the basis for the relativity of simultaneity.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Orthogonality_and_rotation.svg/640px-Orthogonality_and_rotation.svg.png)