on a galactic scale
A Galactic Day is a unit of time equal to one-hundredth of a Galactic Month or ten Galactic Seconds. It is officially a unit in the Basilicus Weights and Measures system. As with all temporal measurements in the BWM, the Galactic Day marks a fraction of the duration of a full rotation of Black Hole Inatus.
The term "Galactic Day" is a generic translation from ancient Helic. The original word, "Yzar" is still in use by the Helics, but most civilizations have adapted a native word to describe the same unit.
Official Definition Edit
One Galactic Day is equal to .01 of a rotation of the Black Hole Inatus. A Galactic day is equal to 851472 Earth seconds.