Editing 1825: 7 Eleven

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Many stores advertise being open 24/7, which means that they're open all day, every day. Many locations of the convenience store chain {{w|7-Eleven}} are now "open 24 hours", again meaning they are always open (despite historically being open only from 7 AM to 11 PM local time, hence its name).
 
Many stores advertise being open 24/7, which means that they're open all day, every day. Many locations of the convenience store chain {{w|7-Eleven}} are now "open 24 hours", again meaning they are always open (despite historically being open only from 7 AM to 11 PM local time, hence its name).
  
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The main joke in the comic refers to the fact that a {{w|Timekeeping_on_Mars#Time_of_day|day on Mars}} (the time it takes for Mars to make a full rotation on its own axis) is about 24 hours and 37 minutes.  If a 7-11 store is open for literally 24 hours per Mars day, then it would actually be closed for around 37 minutes each day.  NASA, for its Mars missions, uses a "Mars-hour" that is one twenty-fourth of a Martian day; had the sign implicitly referred to 24 Mars-hours then the store would be open for the entire Mars day.
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The main joke in the comic refers to the fact that a {{w|Timekeeping_on_Mars#Time_of_day|day on Mars}} (the time it takes for Mars to make a full rotation on its own axis) is about 24 hours and 37 minutes.  If a 7-11 store is open for literally 24 Earth-hours per Mars-day, then it would actually be closed for around 37 Earth-minutes each day.  NASA, for its Mars missions, uses a "Mars-hour" that is one twenty-fourth of a Martian day; had the sign implicitly referred to 24 Mars-hours then the store would be open for the entire Mars day.
  
 
The duration for the Martian day used by [[Randall]] is the Martian {{w|sidereal day}} (how long it takes the non-Sun stars to get to the same position in the sky) of 24 hours, 37 minutes, and 22.663 seconds. However, Mars exploration missions use the Martian {{w|solar day}} (how long it takes the Sun to get to the same position in the sky) or {{w|Timekeeping_on_Mars#Sols|''sol''}} of 24 hours, 39 minutes, and 35.244 seconds. Thus in practice, the 7-11 store would be closed for 39 minutes daily instead of 37 minutes. Likewise, Earth time usually refers to solar days; a typical (mean) sidereal Earth day is 23 hours, 56 minutes, 4.0916 seconds long.
 
The duration for the Martian day used by [[Randall]] is the Martian {{w|sidereal day}} (how long it takes the non-Sun stars to get to the same position in the sky) of 24 hours, 37 minutes, and 22.663 seconds. However, Mars exploration missions use the Martian {{w|solar day}} (how long it takes the Sun to get to the same position in the sky) or {{w|Timekeeping_on_Mars#Sols|''sol''}} of 24 hours, 39 minutes, and 35.244 seconds. Thus in practice, the 7-11 store would be closed for 39 minutes daily instead of 37 minutes. Likewise, Earth time usually refers to solar days; a typical (mean) sidereal Earth day is 23 hours, 56 minutes, 4.0916 seconds long.

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