Earth's circumference
... that Earth's circumference around the poles is almost exactly 40,000 kilometres or 21,600 (i.e. 360 × 60) nautical miles, because it was used to define those units of measurement?
... that <b id="mwBS8"><a href="./Earth's_circumference" id="mwBTA" rel="mw:WikiLink" title="Earth's circumference">Earth's circumference</a></b> around <a href="./Geographical_pole" id="mwBTE" rel="mw:WikiLink" title="Geographical pole">the poles</a> is almost exactly 40,000 kilometres or 21,600 (i.e. 360 <span id="mwBTI" typeof="mw:Entity">×</span> 60) <a href="./Nautical_mile" id="mwBTM" rel="mw:WikiLink" title="Nautical mile">nautical miles</a>, because it was used to define those units of measurement?