ART is not quackery (nor is chiropractic, but unfortunately that stigma has prevailed...). To become a certified ART practitioner, one has to spend a lotta time and money. In other words, the certification criteria appear to be pretty stringent. You may want to confirm your chiro is certified by the ART folks.
The Equinox (Vernal & Autumnal) There are only two times of the year when the Earth's axis is tilted neither toward nor away from the sun, resulting in a nearly equal amount of daylight and darkness at all latitudes. These events are referred to as Equinoxes.The word equinox is derived from two Latin words - aequus (equal) and nox (night). At the equator, the sun is directly overhead at noon on these two equinoxes.
Spring Equinox The Spiritual Meaning of the Spring Equinox Ancient Sacred Sites Aligned to the Spring Equinox A Ceremony to Celebrate the Spring Equinox. Summer Solstice The Spiritual Meaning of the Summer Solstice Ancient Sacred Sites Aligned to the Summer Solstice A Ceremony to Celebrate the Summer Solstice. Autumn Equinox The Spiritual Meaning of the Autumn Equinox Ancient Sacred Sites Aligned to the Autumn Equinox A Ceremony to Celebrate the Autumn Equinox