S&P 500 vs Lunar Node's Speed

There is a remarkable correlation between the Speed of the Lunar Node (a.k.a. North Node a.k.a. Rahu; speed = motion in degrees longitude per unit of time, e.g. per day) and short term changes in the trend (ST CITs) of financial markets when 

1. the speed of the [true] lunar node is 0, and  
2. the lunar node changes direction [ = Min and Max of the swings].

The result is a fast cycle of 2 - 7 CD (Calendar Days). Of course every now and when these ST CITs also meet with major CITs. This motion is known to astrologers and astronomers alike as the retrograde / stationary / direct motion of the lunar node. During lunar and solar eclipses the lunar node starts wobbling, that is it moves back and forth, retrograde, stationary, direct, etc. very quickly (see Moon Wobbles in a NASA animation HERE). And as the Sun approaches 180° towards the node - e.g. in late May 2012 - the lunar node's motion is almost blocked. Some call it the lunar standstill. This is a potential crash period in equity markets.

In astrology the Lunar Node represents the mass, the public at large, also foreign elements or strangers (HERE). So in a market it would mean overseas investors if the North Node were in the 7th house or in the 9th house, in the 3rd house = foreign news, in the 2nd = foreign money, in 10th foreign foreign government, in the 12th, the 6th, and the 8th = foreign losses.

The lunar nodes precess rather quickly around the ecliptic, completing a revolution (called a draconitic or nodical period, the period of nutation) in 18.6 years (note that this is not the same length as a saros). The lunar orbit is inclined by about 5 degrees on the ecliptic: hence the Moon can be up to about 5 degrees north or south of the ecliptic. The ecliptic is inclined by about 23.4° on the celestial equator, the plane that is perpendicular to the rotation axis of the Earth. As a consequence, once during the 18.6-year nodal period, when the ascending node of the Moon's orbit coincides with the vernal equinox, then the Moon reaches extreme northern and southern declinations (Lunar Node's Declination Cycle). Then it also has its extreme northern and southern azimuth points of rising and setting on the horizon; its extreme lowest and highest altitude when crossing the meridian; and potentially extreme late first sightings of the New Moon (more HERE). 

The cycle of the true Lunar Node is always exactly 18.613 Solar Years = 6798.364 CD. The 4th harmonic of 18.618 Solar Years is 1,699.591 CD = 4.6 Solar Years. Hence the North Node moves 30° and enters a new sign in the zodiac every 1.55 Solar Years (= 18.613 months):

18.613 Solar Years / 12 

= 18.613 months
= 1.55 years
= 80.9 weeks 

= 566.53 CD
= 566.53 CD / 8
= 10.12 weeks
= 55 TD (Trading Days)

It was astrologer Carl Payne Tobey (1902-1980) who coined the term Moon Wobble. After a painstaking examination of a large number of major disasters, involving fires, bad weather and loss of life, he found that many of the most serious and traumatic catastrophes occur in association with eclipses, especially when other dire planetary aspects coincided. He also found however that such evils are not exclusively linked to eclipses and may also occur when the Sun forms a T- square to the nodal axis. He called this a Moon Wobble, for it is when the Moon is wobbling in its path by declination. So, when the Sun is conjoined with either node or in this T-square to the nodal axis, this raises the likelihood of major environmental damage, loss of life or property, or other dire effects (more HERE).