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<p>in the history of <a href="page.php?w=geodesy">geodesy</a> and <a href="page.php?w=geophysics">geophysics</a>, it was not defined with any degree of precision until the advent of <a href="page.php?w=satellite_geodesy">satellite geodesy</a> in the mid-20th century. Mathematician <a href="page.php?w=Gladys_West">Gladys West</a> was the first worker to synthesize a high-fidelity geoid from this satellite data. The geoid is one of the essential components of satellite-based <a href="page.php?w=Global_Positioning_System">global positioning system</a>s.</p><p>
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