referencessystems
Reference systems, or coordinate reference systems, provide the framework for specifying positions, orientations, and motions of objects within a given space. They combine a mathematical space (a coordinate system), a measuring unit, and a reference surface or datum that anchors coordinates to the real world. Reference systems can be spatial, temporal, or both, and are essential for navigation, surveying, mapping, astronomy, and physics.
Spatial reference systems include geographic coordinate systems that use latitude, longitude, and sometimes altitude, typically tied
Temporal reference systems define time scales and synchronization, including UTC, TAI, UT1, and various astronomical time
In physics, reference frames can be inertial or non-inertial, and the choice of frame influences the description