Canadian Space Agency
The Astronautics Vocabulary is a glossary of terms that pertain to the science and technology of spaceflight. This alphabetical list can be navigated by clicking on the letters A-Z displayed on this page.
Translation: temps moyen de Greenwich (TMG)
Definition: Astronomical unit based on the Sun's passage over Greenwich (noon). Not to be confused with the hour at which an event occurs in the UT system.
Other Definition: None