The solstices occur when the axis of Earth's rotation points O directly toward and away from the Moon, and the equinoxes occur when the tilt of Earth points toward the galactic center
O directly toward and away from the Sun, and the equinoxes occur when the tilt of Earth's axis is sideways to the Sun
O toward the geographic north pole of the Sun, and the equinoxes occur when the tilt of Earth points toward the geographic south pole of the Sun
O toward the North Star and the equinoxes occur when the tilt points toward the Southern Cross