What is called in astrology the lunar nodes are the two ends of the line of intersection between the plane of the ecliptic (i.e., the plane of the earth's yearly revolution around the Sun) and the plane of the Moon's monthly revolution around the earth.

Lunar Nodes, also called the Moon's Nodes, are the points where the Moon's orbit of the Earth intersects the celestial ecliptic - the narrow band of space described by the Earth's orbit around the Sun

The Moon's Nodes are virtual points that represent the intersection of the Moon's orbit with the Earth's orbit around the Sun (the ecliptic). From a geocentric perspective, the Nodes are the direct result of the motion of the Moon and the Sun around our planet."

Mercury is the planet of communication. If you don't believe me just try having a brief conversation with a Gemini. It makes no difference with Mercury

The two Nodes are always directly opposite one another (180 degrees apart) across the zodiac. As such, they define important polarities in our lives: present lives and past lives. Relating back to the Moon