Although most years of the modern calendar typically have 365 days, a complete revolution around the sun takes approximately 365 days and 6 hours. Every four years one extra day is added to keep the calendar coordinated with the Earth's position in space.
The difference isn't exactly 6 hours. It is more like 5 hours, 49 minutes, and 16 seconds. To compensate for the difference, an end-of-century year is not a leap year unless it is also exactly divisible by 400. This means that the years 1600 and 2000 were leap years, as will be 2400 and 2800, but the years 1700, 1800 and 1900 were not, nor will be 2100, 2200 and 2300.
Leap year does some interesting things with birthdays. You might know that your 28th, 56th, and 84th birthdays are on the same day of the week that you were born. For lots of people, but not everyone, the birthdays when you turn 11, 17, 39, 45, 67, 73, and 95 are also on the same day of the week when you were born. Hey, what about people born on Leap day?
You are looking for a leap treasure in a container attached by something to something.
Good luck, and happy caching!
Congratulations and FTF honors to C3Kid and C3GPS.
