![]() the provision of observed or predicted values and parameters to describe the orientation of the Earth with respect to astronomical reference systems.astronomical data in almanacs and websites employing the current definition of UTC and.astronomical software and applications that assume the current definition of UTC.terrestrial telescopes, antennas, and other instruments pointed in precise directions.Any change in the definition of UTC could also present a cause for concern among producers and users of astronomical data. If UTC is redefined, applications that currently use UTC as a low-accuracy representation of UT1 may be compelled to change their strategy, update their basic software, and educate their users about these changes. The current definition of UTC ensures that the difference between UT1 and UTC (i.e., UT1‑UTC) remains under 0.9 seconds, which allows easy access to UT1 through UTC for those applications that do not need high precision. The rotation angle of the Earth in a celestial reference system is described by the angle UT1. Dennis McCarthy, International Astronomical Union Representative to the Consultative Committee for Time and Frequency and BIPMĪstronomical applications that use the current definition of Coordinated Universal Time (UTC) to access UT1 - the Universal Time based on Earth’s rotation - would be impacted by any change in the definition of UTC.
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