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<p>in a <a href="page.php?w=homogeneous_space">homogeneous space</a>.</p>

<p><big>Introduction</big></p>
<p>In lay terms, a <a href="page.php?w=frame_of_reference">frame of reference</a> is a system of <a href="page.php?w=measuring_rod">measuring rod</a>s used by an <a href="page.php?w=observation">observer</a> to measure the surrounding space by providing <a href="page.php?w=Cartesian_coordinate_system">coordinates</a>.  A <b>moving frame</b> is then a frame of reference which moves with the observer along a <a href="page.php?w=trajectory">trajectory</a> (a</p><p>
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