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How long does it take for your eyes to adjust to the darkness?

On average, it takes 30 to 45 minutes for your rods to be fully dark adapted to night vision.Β 

It also covers things such as Mesopic vision and Scotopic vision, eye health, and how to actually dark adapt. I suggest it as a good read.

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How long do your eyes need to adapt to darkness and reach full contrast?

biology.stackexchange.com

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Why does February have 29 days?

February 29 is a date that usually occurs every four years, and is called leap day.Β 

  • This day is added to the calendar in leap years as a corrective measure, because the Earth does not orbit around the sun in precisely 365 days.Β 
  • The Gregorian calendar is a modification of the Julian calendar first used by the Romans.

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