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<p>Part of its mission involves the determination of a time scale based on the current rate of the rotation of the Earth. Other services of IERS are at the <a href="page.php?w=Paris_Observatory">Paris Observatory</a>.</p>

<p><a href="page.php?w=Universal_Time">UT1</a> is the non-uniform time defined based on the Earth's rotation.</p>

<p>It defined the <a href="page.php?w=IERS_Reference_Meridian">IERS Reference Meridian</a>, the <a href="page.php?w=International_Terrestrial_Reference_System">International Terrestrial Reference System</a> (ITRS),</p><p>
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