Dr. Farr why south node and not north node?
Actually I did not mean to slight the importance of the North Node (the Dragon's Head) It is just that I tend to look at the South Node as a portent of problems because most of what I actually use astrology for is in the medical field, and we search charts for trouble/problem indicating pointers (relating to health) moreso than we do in looking for benefic pointers, since in astro-therapeutics we want to antidote/modify the health disruptive elements shown in the chart.
So yes I will say that the NN is equally important to the SN when making complete astrological dleineations.
But back to the Dragon's Tail for a moment: this Node tends to be frequently overlooked because:
-none of the free chart services (such as astro.com) mark it on any of their charts (they mark the NN, but not the SN), so when we look at these charts we have to imagine the SN (its always directly opposite where the NN is marked on the chart)
-we very often neglect the SN when considering Parallels of declination: again, the free chart services do not note the declination of the SN: on the astro.com pdf for declinations, etc, while the NN declination is listed, the SN declination is not listed: here again we must calculate it in our mind (the SN declination is the same as the NN declination ONLY IT IS ON THE OPPOSITE SIDE OF THE ECLIPTIC, eg, if the listed NN declination is given as North, then the SN declination is the same degree but SOUTH, or if the listed NN declination is given as South, then the SN declination is the same degree but NORTH)
-too often, if we don't find the SN in conjunction with a planet, Lot or anguluar degree on the chart, we fail to check if the SN might be in Parallel of declination with a planet or degree (like the ascending degree or MC degree)-this oversight can be a fruitful source of delineative error: say we are all enthused about Jupiter because of how well it is placed and the benefic aspects to it-and the SN in longitude is far away from it: now, though, we consider the declinations and find Jupiter within a degree of Parallel of declination with the SN-this puts a VERY different delineative spin on the actual Jupiter influences in that chart.