What celestial event corresponds to the ecliptic intersection point at $180^ ext{circ}$ longitude?
Answer
The autumnal equinox.
The ecliptic intersects the celestial sphere at $0^ ext{circ}$ longitude, corresponding to the vernal equinox, and at $180^ ext{circ}$ longitude, corresponding to the autumnal equinox.
#Videos
The Ecliptic: Crash Course Kids #37.2 - YouTube
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