Assertion: ellipse's distance | /r/AtLocation | its aphelion
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Source sentences:
text: When the planet, therefore, is at A it is nearest the sun, and is said to be in its perihelion ; its distance from the sun gradually increases until it reaches the point, B , when it is at its greatest distance the sun, and is said to be in its aphelion ; when it arrives at the points D and E of its orbit, it said to be at the mean distance . ...