Starship Shift Rotation

Star Command Starships usually operate with a three 8-hour shift rotation, Alpha Shift, Beta Shift and Night Watch. 
Alpha Shift id the "primary" shift that will be presided over by the Captain and majority of senior officers, although there will be some rotation of department heads across all three shifts. Beta is the second "daytime" shift, usually commanded by the Executive Officer. Night Watch operates during a starships "night," hence the name, and if often used as a proving ground for young up-and-coming officers to but their teeth in command. The Third Officer usually commands Night Watch.
Alpha Shift operates from 08:00 - 16:00
Beta Shift operates from 16:00 - 00:00
Night Watch Operates from 00:00 - 08:00