- "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. Twenty-four hours was considered to be a standard day.
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).
Behind the scenes
The length of the standard day is derived from the length of one Earth day.
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:
- Jedi Academy
- Jedi Academy: Return of the Padawan
- "Kessel Run" — Star Wars Tales 16
- "Sandstorm" — Star Wars Tales 15
- "Smuggler's Blues" — Star Wars Tales 14
- The Star Wars 3
- "The Long, Bad Day" — Star Wars Tales 16 (Title only)
- "Best Birthday Ever" — Star Wars Tales 16
- "Do or Do Not" — Star Wars Tales 15