Earth is in a stable orbit sure, and I don’t think the aphelion and perihelion are changing but the orbit is slowly rotating around the Sun ultimately drawing a kind of flower-like shape. Why? Why does that not end up changing our aphelion and perihelion?
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Aphelion and perihelion do change a little bit each orbit. It’s precession. It’s caused by the earth accelerating as it gets closer to the sun and from the effect of gravity from everything else in the solar system. Stable does not fixed and constant.
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