Which constellation must the Sun physically cross the boundaries of, leading to a count of thirteen zodiacal constellations astronomically?

Answer

Ophiuchus.

The Sun spends approximately 18 days passing through the boundaries of Ophiuchus, the Serpent Bearer, which is located between Scorpius and Sagittarius.

Which constellation must the Sun physically cross the boundaries of, leading to a count of thirteen zodiacal constellations astronomically?

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The Ecliptic: Crash Course Kids #37.2 - YouTube

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