SAN FRANCISCO — Scientists and mathematicians globally are observing Pi Day today, celebrating the mathematical constant that dictates the ratio of a circle’s circumference to its diameter. Beyond the traditional mathematical exercises, researchers are highlighting how the continuous number remains foundational to modern aerospace engineering and advanced medical diagnostics.
The annual March 14 observance was established in 1988 by Larry Shaw at the San Francisco Exploratorium. The museum is scheduled to continue the tradition today with a procession around a designated pi shrine, slated to begin at exactly 1:59 p.m. local time to represent the constant’s first six digits, 3.14159.
Deep Space Navigation
In aerospace engineering, pi is actively utilized to manage spacecraft motion and propulsion systems. Artur Davoyan, a mechanical and aerospace engineering professor at the University of California, Los Angeles, stated that the constant is required for virtually every formula regarding orbital mechanics.
NASA engineers rely on pi to communicate with distant spacecraft, including the Voyager 1 and Voyager 2 probes. The calculations are necessary to determine Earth’s exact orbital position, design effective communication antennas, and decode interstellar signals transmitted back to mission control.
Advancing Medical Diagnostics
In the field of bioengineering, the constant is currently being applied to accelerate disease detection and cancer research. Dino Di Carlo, chair of the UCLA bioengineering department, utilizes pi to calculate surface tension and control the volume of microscopic polymer droplets.
These engineered droplets function as microscopic test tubes for individual cells. This specific methodology is currently deployed in the discovery of antibodies designed to block signals emitted by cancer cells. Furthermore, Di Carlo’s application of pi in fluid dynamics enabled the engineering of a rapid diagnostic test for Lyme disease. The engineered test produces results in 20 minutes, a significant reduction from previous testing methods that required several days to process.