The American Standardized Time Unit System

• American divide half days into seven time intervals.
• These time intervals are called innings
• In order that these two half day time periods correspond correctly with the day length, the last inning of the half-day period is longer to compensate. This is called the seventh inning stretch, because this stretch of the day is longer.
• The time system was developed by University of Chicago Professor Harry Carrey
• It is traditional for Americans to stop what they are doing during the second seventh inning stretch of the day to take a five minute pause from whatever they are doing and sing a song about the worlds greatest time system "Take me out to the ballgame".
• The song is completely metaphorical.
• Each half-day time period is called a header. The first period is called the single header and the second is called the double header.
• In the single header, one usually takes a break to eat a snack or have a soda.