### Leap Years

A leap year is a year that has `366` days. The month of February, which typically has `28 days`, has `29` days during leap years.

```   "In modern terms, the time it takes for the Earth
to circle the Sun is slightly more than the time
it takes for the Earth to rotate 365 times (with
respect to the Sun -- actually we now know this
```

`365.24219` written as a mixed number is...

```        24,219
365 -------
100,000
```

2004 was a leap year.

```       February 2004
Su Mo Tu We Th Fr Sa
1  2  3  4  5  6  7
8  9 10 11 12 13 14
15 16 17 18 19 20 21
22 23 24 25 26 27 28
29
```

2005 was not a leap year (i.e. it was a common year).

```       February 2005
Su Mo Tu We Th Fr Sa
1  2  3  4  5
6  7  8  9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28
```

Prior to 1753, a year was a leap year if it was evenly divisible by four. After 1752, a year was/is a leap year if it is evenly divisible by four and not by `100`, or it is evenly divisible by `400`.

```       February 1752
Su Mo Tu We Th Fr Sa
1
2  3  4  5  6  7  8
9 10 11 12 13 14 15
16 17 18 19 20 21 22
23 24 25 26 27 28 29

1752 was a leap year because 4 evenly divides into 1752

September 1752
Su Mo Tu We Th Fr Sa
1  2 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30
```

In the Gregorian calendar, `303` of every `400 years` are common years.

1. Was year 2000 a leap year?
2. Was year 1900 a leap year?
3. Will year 2008 be a leap year?
4. Will year 2010 be a leap year?
5. Will year 2038 be a leap year?
6. Will year 2100 be a leap year?
7. Will year 10,000 be a leap year?

Creator: Gerald D. Thurman [gthurman@gmail.com]
Created: 24 February 2005