How do the actual durations the Sun spends in astronomical constellations compare to the traditional zodiac slices?
Answer
The actual constellation boundaries are irregular in size, leading to varying amounts of time spent in each one.
The traditional zodiac system divides the year into twelve sections, treating each as equal $30$-degree slices along the ecliptic. However, the actual boundaries of the constellations in the sky, which are based on established astronomical measurements rather than arbitrary divisions, are irregular in size. Because these actual boundaries vary in angular width, the Sun spends a differing amount of time passing through each constellation zone. Some constellations will cover a longer span of days, while others will be traversed more quickly.
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