# Leap year question

#### bigredguy

##### Platinum Member
Since the tropical year is 365.242190 days long, a leap year must be added roughly once every four years (four times the fractional day gives ).

my question is that .242190 does not equal .25 so after a thousand year would we have a leap year without an extra day?

#### Lager

##### No Lifer
must be it leapt off the page

ok, he put it up.
my answer to that question is to stop the brain strain immediately

#### kenshorin

##### Golden Member
Originally posted by: bigredguy
my question is that .242190 does not equal .25 so after a thousand year would we have a leap year without an extra day?

I figure no, since we have to catch up for all those other years where the calendar was wrong, or that didn't even have a calendar at all, gotta make up those lost days!

#### konichiwa

##### Lifer
We have a leap day in:

Every year divisible by 4
EXCEPT the last year of each century, such as 1900, which is NOT a leap year . . .
EXCEPT when the number of the century is a multiple of 4, such as 2000, which IS a leap year . . .
EXCEPT the year 4000 and its later multiples (8000, 12000, etc) which are NOT leap years.

#### dave127

##### Senior member
here it is:

The calender we use (the Gregorian Calendar, adopted by pope Gregory XII i believe) has a leap year every four years EXCEPT years divisible evenly by 400....this allows for the extra little percentage of a day, and allows for an error of one day for every 3000 years

EDIT: ok....so maybe my astro teacher taught us a bit wrong

#### TallBill

##### Lifer
Originally posted by: konichiwa
We have a leap day in:

Every year divisible by 4
EXCEPT the last year of each century, such as 1900, which is NOT a leap year . . .
EXCEPT when the number of the century is a multiple of 4, such as 2000, which IS a leap year . . .
EXCEPT the year 4000 and its later multiples (8000, 12000, etc) which are NOT leap years.

wow, just wow. I need to go do something important today that wont have a normal anniversery.

#### bigredguy

##### Platinum Member
looked it up and we lose 27 secs every year so thats 1 day every 3236 years. So would that mean in about 3000 years we would have a year that met the leap year rules but did not leap?

#### TallBill

##### Lifer
i wonder if theres any leap year social clubs that meet on the 29th. if not, i should start one today.

#### MacBaine

##### Banned
We should just add 6 hours every year that don't count. At 11:59 they begin, and 6 hours later, 12:00. You can do whatever the fvck you want and it won't count.

#### Thoreau

##### Golden Member
Originally posted by: konichiwa
We have a leap day in:

Every year divisible by 4
EXCEPT the last year of each century, such as 1900, which is NOT a leap year . . .
EXCEPT when the number of the century is a multiple of 4, such as 2000, which IS a leap year . . .
EXCEPT the year 4000 and its later multiples (8000, 12000, etc) which are NOT leap years.

1900 *is* a multiple of four. 2000 is the last year of that century.

#### bigredguy

##### Platinum Member
Was just reading something that said 1896 way a leap year but 1900 wasn't, because it didn't fit the rules. And that this will happen again in about 100 years between 2096 and 2104. I thought leap year was just every 4 years like the olympics or presidential election year. Wow, i feel un-edumacated.

#### konichiwa

##### Lifer
Originally posted by: Thoreau
Originally posted by: konichiwa
We have a leap day in:

Every year divisible by 4
EXCEPT the last year of each century, such as 1900, which is NOT a leap year . . .
EXCEPT when the number of the century is a multiple of 4, such as 2000, which IS a leap year . . .
EXCEPT the year 4000 and its later multiples (8000, 12000, etc) which are NOT leap years.

1900 *is* a multiple of four. 2000 is the last year of that century.

Note what I said -- "except when the NUMBER OF THE CENTURY" is a multiple of four. Hence, 19 is not a multiple of four but 20 is

Or, if you prefer, the last year of every century is NOT a leap year UNLESS that year is divisible by 400