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1. Introduction; 2. Evolution of time scales and their associated interval units; 2.1. Universal Time (UT); 2.2. Ephemeris Time (ET); 2.3. The downing of atomic time; 2.4. The birth of Coordinated Universal Time UTC; 3. Metrologic qualities of a time scale; 4. Relativity and time scales; 4.1. Proper and coordinate quantities; 4.2. Coordinate systems; 4.3. Practical realizations of the coordinate systems; 4.4. Coordinate times; 5. Realization of TAI and UTC; 5.1. An essential tool: clock comparisons; 5.2. Use of GPS for time transfer; 5.3. Two-way satellite time and frequency transfer; 5.4. Calibration of time transfer equipment and link uncertainties; 6. The algorithm Algos; 6.1. The general scheme; 6.2. Clocks in TAI; 6.3. Free Atomic Time Scale (EAL), clock weighting and frequency prediction; 6.4. Primary frequency standards (PFS); 7. Secondary representations of the second; 8. Dissemination and access to the time scales; 9. List of acronyms used in the text (in English and French when applicable)
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