Here's what this means:

* RA (Right Ascension): 12 hours. This refers to the position along the celestial equator, measured eastward from the vernal equinox (the point where the Sun crosses the celestial equator in spring).

* Dec (Declination): 0 degrees. This refers to the position above or below the celestial equator, measured in degrees.

Important Notes:

* The autumnal equinox is not a fixed point in the sky. Due to the precession of the Earth's axis, the exact location of the equinox shifts slightly over time.

* The coordinates are approximate. The exact position of the equinox may vary slightly depending on the year and the specific method used to calculate it.

* The autumnal equinox marks the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.

Let me know if you have any more questions about celestial coordinates or the equinox!