The mathematical constant Pi (3.14159…) is celebrated annually on March 14 (3-14) — this year especially because it’s 3-14-15, Pi’s first six digits. Pi is heavily used in astronomy, and on Pi Day the Cincinnati Observatory will teach visitors how to measure circumference, area and volumes of the domes and planets using the concept. All the thinking power will be fuelled by slices of pie provided by Frisch’s and pizza from Pi Pizzeria.
8-10 p.m. Saturday. $5. No reservations required. 3489 Observatory Place, Mount Lookout, cincinnatiobservatory.org.
This article appears in Mar 4-10, 2015.