What is the name given to the farthest point a planet reaches from the Sun during its revolution, where its speed is minimum?
Answer
Aphelion
Aphelion is the designation for the point in a planet's elliptical trajectory where it is maximally distant from the Sun. Corresponding to this greatest separation, the planet's orbital speed is simultaneously reduced to its minimum level for that orbit. This phenomenon, where speed varies inversely with distance from the central body, is governed by Kepler's Second Law (the law of areas) and is fundamentally required by the conservation of angular momentum. For Earth, the aphelion point is reached around July 4th.
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