= International Celestial Reference System and its realizations
{wiki=International_Celestial_Reference_System_and_its_realizations}
The International Celestial Reference System (ICRS) is a fundamental framework used in astronomy to define the positions of celestial objects. It provides a standardized reference system for the sky, similar to how the International Reference System (IRS) provides a reference for positions on Earth. \#\#\# Key Features of the ICRS: 1. **Fixed Reference Frame**: The ICRS is designed to be a quasi-inertial reference frame, meaning it doesn't move relative to distant stars.
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