What's Up With Leap Years?

Wearing the teacher hat means that I am always on the lookout for opportunities to study something relevant. Today presented me with an astrological mini-study: Leap Years. Here's the unit I put together this morning.

First of all, a big Happy Birthday to all of you "Leaplings." This is a great video about why you are so special:

Here is an activity page from Scholastic:
::Scholastic: Celebrate Leap Day!::

Gregorian Calendar Rules:

1. Every year divisible by 4 is a leap year
2. But every year divisible by 100 is NOT a leap year
3. Unless the year is also divisible by 400, then it is still a leap year.

Check out this book about Leap Years. It may the only one of it's kind:
Finally, look what Google did to it's Logo today. Always on the ball, those guys: