Surveying is one of the world’s most enduring professions – since ancient times, it has been key to establishing international boundaries, marking property boundaries, and ensuring that engineering and architectural structures and precisely aligned and properly constructed.

With this long history, it might follow that surveying itself is a dated profession, but the opposite is true. As advancements in astronomy and mathematics were achieved, these advancements were immediately applied to surveying.

Today has been officially known as π (Pi) day since 2009 when the US House of Representatives passed a non-binding resolution recognizing March 14 as National Pi Day. Aside from being a great day to eat pie, it’s a great day to celebrate how mathematics, and one specific concept, has shaped our world.

Surveyors have been at their labors for millennia. It’s commonly understood that the Egyptians were the first surveyors, but new evidence finds that another civilization was using cadastral surveying around the same time – perhaps even earlier. This image of a Babylonian clay tablet depicts a surveyor’s plan of a field – dated at circa 3,700 BC.