Terran day

Terran day‏‎

A period of time. While the Unit of Measurement (TD) for a time period of 24 (old hours) is outdated and no longer used officially, it is a measurement that is still used by billions of Terran  Origin humans. It refers to the time planet Earth takes to rotate on its own axis. TD is split into : Day and Night (Each 12 hrs). It is also the planet and term where the expressions : Good Morning and Good Night originate.

Some products and companies still use TD