Assertion: cartesian coordinate system's origin | /r/AtLocation | the centre of the earth
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Source sentences:
text: and since the required distance can be found from the Cartesian coordinates of A and B, we should turn students' attention to the task of converting latitude-longitude coordinates into Cartesian ones after informing them that the origin of the Cartesian coordinate system is at the centre of the Earth, the positive part of the x-axis goes through latitude 0 and longitude 0, and the positive part of the z-axis goes through the North Pole.