We will be LEAPING around Jackson TN to celebrate the 29th day of February (refer to the waypoints):
- We will start with appetizers and cachin' tales from 5:30 to 6:30PM at the main coordinates.
- Then LEAP over to dinner from 6:30 to 8:00PM.
- Finally LEAP over to the final stage for some after dinner coffee and MORE cachin' tales from 8:00 to 9:00PM.
Make it to all stages/leaps or any of them...just make it!!
A leap year (or intercalary year) is a year containing one or more extra days (or, in case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, February would have 29 days in a leap year instead of the usual 28. Seasons and astronomical events do not repeat at an exact number of full days, so a calendar which had the same number of days in each year would over time drift with respect to the event it was supposed to track. By occasionally inserting (or intercalating) an additional day or month into the year, the drift can be corrected. A year which is not a leap year is called a common year.
The Gregorian calendar, the current standard calendar in most of the world, adds a 29th day to February in 97 years out of every 400, a closer approximation than once every four years. This is implemented by making every year divisible by 4 a leap year unless that year is divisible by 100. If it is divisible by 100 it can only be a leap year if that year is also divisible by 400. So, in the last millennium, 1600 and 2000 were leap years, but 1700, 1800 and 1900 were not. In this millennium, 2100, 2200, 2300, 2500, 2600, 2700, 2900 and 3000 will not be leap years, but 2400 and 2800 will be. By this rule, the average number of days per year will be 365 + 1/4 - 1/100 + 1/400 = 365.2425. The Gregorian calendar was designed to keep the vernal equinox on or close to March 21, so that the date of Easter (celebrated on the Sunday after the 14th day of the Moon that falls on or after 21 March) remains correct with respect to the vernal equinox. The vernal equinox year is about 365.242374 days long (and increasing), whereas the average year length of the Gregorian calendar is 365.2425. The marginal difference of 0.000125 days means that in around 8,000 years, the calendar will be about one day behind where it should be. But in 8,000 years, the length of the vernal equinox year will have changed by an amount which cannot be accurately predicted (see below). Therefore, the current Gregorian calendar suffices for practical purposes, and Jaggars's correction (making 4000 AD not a leap year) will probably not be necessary.