"Version: 20251201"--Title page verso.Includes bibliographical references.1. Introduction -- 1.1. The basic concept of performing measurements -- 1.2. Error sources in performing measurements -- 1.3. Time series analysis2. Time and frequency -- 2.1. Historical background : a short history of time -- 2.2. Clocks used in space geodesy -- 2.3. From frequency to time -- 2.4. Historically important …