Dennis D. McCarthy Bücher

Filling the need for a book that conveys the current technology as well as the underlying history and physical background, this book tells physicists and engineers how to measure time to the precision required for modern-day use. The authors draw on their longstanding research experience with timekeeping and high-precision measurement to cover the use of satellites in measuring earth movement variation and the influence of the moon, while also dwelling on such topics as timekeeping aboard satellites and time transfer. Indispensable for high-precision measurements of processes in astrophysics, and relevant for measurement, navigation and communication, this monograph can be equally used as a course book or as accompanying work at advanced undergraduate or graduate level.

This document defines the standard reference systems established by the International Earth Rotation Service (IERS), along with the models and procedures utilized for this purpose. It continues the series initiated with the Project MERIT Standards and subsequent IERS Standards and Conventions. The current issue is referred to as the IERS Conventions (2003), previously noted as the IERS Conventions (2000) in earlier publications. All IERS products align with the descriptions provided in this document. Contributors to the IERS must identify any deviations from these guidelines and assess the impacts of such departures to ensure their results can be related to the IERS Reference Systems. While contributors may employ alternative models, the sensitivity of products derived from different observation methods to the established standards and reference systems has not been evaluated in this document. The IERS reference systems and procedures are grounded in resolutions from international scientific unions. The celestial system follows IAU Resolution A4 (1991), officially initiated by IAU Resolution B2 (1997) and refined by IAU Resolution B1 (2000). The terrestrial system is based on IUGG Resolution 2 (1991), with transformations between the celestial and terrestrial systems relying on IAU Resolution B1 (2000).