Standard day/Legends

"This will be a day long remembered."

- Darth Vader

A day was a unit of time on the Galactic Standard Calendar. One day was the amount of time it took for a planet to make one complete rotation on its polar axis.

The length of a day varied between planets. The length of day for most terrestrial planets not subjected to tidal locking was in the range of 18 to 36 standard hours. Tide-locked planets did not have days. Satellite planets - moons orbiting a gas giant - were almost always tide-locked to the gas giant they orbited. Satellites may have days several dozen hours long (as long as it takes the satellite to orbit the gas giant).

Twenty-four hours was considered to be a standard day.

Behind the scenes
The length of the standard day is derived from the length of one Earth day.

Appearances
Since a day is a unit of time and all Star Wars novels, journals, comics, guides, and role-playing games have some interval of elapsed time, day is indirectly mentioned in almost every Star Wars source.

The following is a list of appearances of day when it is used in dialogue; or when it is specifically mentioned or defined: