In astrology, the Moon's Node refers to the two points where the Moon's orbit intersects the ecliptic (the plane of the Earth's orbit around the Sun). The North Node, or Rahu, is the ascending point of the Moon's orbit whle the South Node, or Ketu, is the descending point of the Moon's orbit.
Whenever a planet hits these Nodes, extreme volatility is seen in stocks and temporary tops and bottoms are observed.
This indicator plots these periods and also shows upcoming dates if it falls in the next 7 days.