The Role and Future of Leap Seconds in International Atomic Timekeeping

Abstract

Time serves as a critical element in modern society, influencing numerous and diverse sectors such as finance and digital governance, telecommunications, navigation, and emerging technologies like Artificial Intelligence, and the Internet of Things (IoT). To ensure precise timekeeping, the ensemble of extremely accurate atomic clocks generate International Atomic Time (TAI) based on atomic frequency standards. However, the dynamic nature of the Earth's rotational speed introduces variations in earlier used time scale, Universal Time (UT1), which relies on the Earth's rotational dynamics.Therefore, to establish synchronization, Coordinated Universal Time (UTC) was formed, incorporating leap seconds to closely align with UT1. This paper explores the factors that sustain the link between UT1 and UTC, discusses the pros and cons of the leap second system, and highlights potential issues if it remains unaddressed.