I agree with the others, don't treat bigeminy. ...It's some kind of EMS lore that never seems to die that bigeminy is a terribly malignant rhythm and has to be squashed no matter what the consequences.
The meaning of the autumn equinox is intertwined with that of the four points of the year (the two solstices, and the spring equinox), which each mark stages in the esoteric work that begin anew each year, and form a symbolic cross in the wheel of the year, with the sun (Son/Christ) at the center.
The word vernal refers to the season of spring, as the word autumnal refers to the season of autumn, or fall. The vernal equinox for one half of the Earth is the start of the Spring season, and one of two times a year when the day and night are roughly equal in length for most of the planet. At these times the Sun crosses the plane of the Earth's equator. The vernal equinox for the Northern Hemisphere is the March equinox (March 20). The vernal equinox for the Southern Hemisphere is either September 22 or 23, the day termed the autumnal equinox for the north.