BIPM – Bureau International des Poids et Mesures

The BIPM (Bureau International des Poids et Mesures) is the international organization responsible for ensuring worldwide uniformity of measurements and maintaining the International System of Units (SI). In geodesy, the BIPM plays a crucial role in providing and coordinating international time scales such as International Atomic Time (TAI) and Coordinated Universal Time (UTC), which are fundamental for satellite-based positioning, space-geodetic techniques, Earth rotation monitoring, and the realization of global reference frames.