The Pi Day Google Doodle was made by the inventor of the Cronut - here's what to know about the day

Google/Screenshot

The Pi Day Google Doodle looks delicious.

• Pi Day was first established 30 years ago in 1988 by physicist Larry Shaw.
• The day celebrates the number ��, 3.14, and is also Albert Einstein's birthday and now the day Stephen Hawking died.
• If you'd like to celebrate the day with a delicious pie, Google got Cronut creator Dominique Ansel to share a recipe for a salted caramel apple pie.

If you haven't baked your favorite pie to celebrate Pi Day yet, Google has you covered.

Today, March 14th, is the 30th anniversary of Pi Day (for, you know, 3/14 or 3.14). Not only does the day recognize the tasty-sounding mathematical constant that "represents the ratio between a circle's circumference (perimeter) to its diameter (distance from side to side passing through the center)," it's also both the birthday of Albert Einstein and now the death day of famed theoretical physicist Stephen Hawking.

The number Pi itself (Greek letter ��) in an irrational number that can't be represented as a fraction of two whole numbers (though we often use 22/7, which works well enough). And it's a number that continues to infinity. So far, mathematicians have calculated it out to 22 trillion digits.

The doodle celebrating that number is a salted caramel apple pie created by Dominique Ansel, the pastry chef who invented the croissant-donut hybrid "cronut."

The recipe itself looks delightful - and includes bourbon. Check it out here.

Pi Day was first recognized and celebrated by physicist Larry Shaw in 1988.

So go ahead and celebrate with a slice.