What phenomenon causes the spatial separation between the tropical sign Capricorn and the constellation Capricornus?

Answer

Precession of the equinoxes

The slow, long-term wobble in the Earth's axis, known as the precession of the equinoxes, causes the apparent position of constellations to shift relative to fixed calendar dates.

What phenomenon causes the spatial separation between the tropical sign Capricorn and the constellation Capricornus?
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