The Schuler pendulum is a pendulum design that is used to measure the rotation of the Earth. It was named after German engineer and scientist, Karl Ludwig Schuler, who first proposed the idea in 1923. The design of the Schuler pendulum has been refined over the years, but it remains an important tool for measuring the rotation of the Earth. Some synonyms for the Schuler pendulum include "inertial pendulum," "gyroscopic pendulum," and "Earth rotation pendulum." These terms all refer to different aspects of the Schuler pendulum's design and function, but they all ultimately describe the same tool used to measure the rotation of our planet.