March 14 is the day math lovers (and most other people) celebrate pi, the measurement calculating the ratio of a circle's circumference to its diameter, the first three numbers of which are 3.14.

The number itself can go on forever. Google announced today one of its employees had calculated pi to a record 31.4 trillion digits.

» National Pi Day in Atlanta: Find out how to get free and cheap pie and pizza

» Pi Day: Woman spends months calculating 3.14 to 31.4 trillion digits for world record

Whether you love math or pie (yes, pizza pie counts), you’ll enjoy some of the best social media posts celebrating Pi Day 2019.

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Fireworks will be set off at dusk at Alpharetta’s Independence Day event at Wills Park. The photo shows a view of a previous year’s fireworks from the nearby Walk of Memories at American Legion Post 201. (Courtesy of Alpharetta Convention & Visitors Bureau/Jack Tuszynski)

Credit: Jack Tuszynski/PhotoJack.net

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Cabbagetown resident Nadia Giordani stands in the door of her 300-square-foot tiny home in her backyard that she uses as a short-term rental to help her pay for rising property taxes in the area. (Riley Bunch/AJC)

Credit: Riley Bunch/riley.bunch@ajc.com