- the speed of the [true] lunar node is 0, and
- the lunar node changes direction [ = Min and Max of the swings].
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
= 1.55 years
= 80.9 weeks
= 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).