If you were standing on the equator, which of the following positions in the sky would pass through your zenith at some time in one 24-hour period? A) The north celestial pole, which is the perpendicular to the celestial equator. B) The position of the Sun at summer solstice C) Vernal equinox, or 0 hours right ascension, 0 declination D) The ecliptic pole, or perpendicular to the ecliptic plane.