Do you know the second tab. The second what? You can have fun asking the question in your entourage, you will find few people who know this function of time correction.
The objective of the "interlayer seconds" is to make up for the possible difference between the atomic and solar hours. There is an international consensus on time measurement standards that coincides with two different definitions of time: Universal Time (UT), which is a time scale based on the rotation of the Earth, and Coordinated Universal Time (UTC). measured by atomic clocks since 1972
However, the rotation of the earth is not regular since exogenous factors (effects of the tide, the Moon, the Sun, etc.) can influence it, leading to a discrepancy between universal and coordinated universal time. To offset these effects, the International Atomic Time (IAW) was introduced in 1972, based on a set of atomic clocks distributed on Earth.
Leap seconds are added or removed at the end of the last minute of the last day of the month preceding July 1 or January 1.
The "Earth Rotation and Reference Systems Service", created in 1988 and located at the Paris Observatory, decides on the introduction of the second divider. Thus, on a regular basis since that date, the UTC is adjusted, in the form of leap seconds, in order to obtain a civil time that does not deviate too much from the average solar time.
