Question

38 when referring to right ascension, the zero hour is located at
the spring equinox
the north pole
the equator
the summer solstice
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Explanation:

Right - ascension is an astronomical coordinate similar to longitude on Earth. The zero - hour of right - ascension is defined to be at the vernal (spring) equinox. It serves as the reference point for measuring right - ascension in the celestial sphere.

Answer:

the spring equinox