Nodal Transits Explained

For Sam, with Libra rising and natal Venus at 20 degrees of Gemini, the North Node at 27 Gemini needs about 4.4 months to reach Venus, and a 2-degree orb gives a 2.5-month window.

A transit compares where a body is in the sky now with where it stood in your birth chart. A nodal transit does the same with the lunar nodes: the two points where the Moon’s path crosses the ecliptic, which sit exactly opposite each other and move backward through the zodiac.

Two kinds of event are usually meant. One is a node touching a planet or angle in your chart, a contact. The other is the nodal axis moving through a pair of houses. Both are slow, and astrologers read both as themes to reflect on rather than events to expect. Mean and true node conventions can differ by a degree or two, so use the same one for your natal chart and for the transit.

The mean node covers 360 degrees in about 18.6 years, so it moves about 19 degrees a year, about 1.6 degrees a month and a little over 0.05 degrees a day. It spends about 1.5 years in each sign. The true node wobbles around that path and can differ from the mean by a degree or two, which is a month or so of motion.

That speed sets how long a contact lasts. The window is your orb, counted on both sides of the natal degree, divided by 1.6 degrees a month. Each degree is crossed once per cycle, though the true node’s wobble can shift dates by a few weeks.

Because the nodes are opposite, one node cannot touch a point without the other touching the opposite point. When the North Node conjoins a natal planet, the South Node opposes it. When the North Node squares a planet, the South Node squares it from the other side, so the axis and that planet form a T-shaped pattern.

It therefore makes little sense to ask whether a contact belongs to the North Node or the South Node. Astrologers usually read the whole axis, and the useful question becomes which end the planet sits on. A planet at the North Node end may be described as drawn toward growth themes, and one at the South Node end as going over familiar ground. Both phrases are modern interpretive language, not astronomy.

Practice varies. These are the readings that come up most often, usually with orbs of about 1 to 3 degrees for a body as slow as the node.

• Node on the Sun or Moon: a stretch when questions about identity or emotional habits feel more present.
• Node on Venus: relationships and values come into focus, often as topics that seem to keep turning up.
• Node on Mars: questions about how you assert yourself and where your energy goes.
• Node on Mercury: conversations, study and decisions pick up a theme.
• Node on Jupiter or Saturn: questions of growth and of responsibility, read as lasting longer in feel.
• Node on the Ascendant or Midheaven: attention to self-presentation or direction.

Because the nodes go backward, the axis moves from higher house numbers to lower ones. In whole-sign houses it spends about 1.5 years in each pair of houses, so it crosses all six pairs in about 9.3 years, and the full 18.6-year cycle brings each node back to its starting point. In quadrant systems the time varies with house size: a house about 40 degrees wide keeps a node for about 2 years, and one about 20 degrees wide for about 1 year.

Astrologers read the pair currently occupied as the area where themes surface. When the axis sits across the 4th and 10th houses, for example, the topics are home and family at one end and public role at the other, and about a year and a half later it has moved on to the 3rd and 9th.

A solar eclipse is a new Moon where the Moon passes between Earth and Sun; a lunar eclipse is a full Moon where Earth’s shadow falls on the Moon. Both happen only when the new or full Moon lies close to a node, where the Moon’s path crosses the Sun’s.

That is why eclipse seasons arrive about twice a year, about 173 days apart. Because the nodes shift about 19 degrees a year, each season sits roughly 9 or 10 degrees farther back along the axis than the one before, and about 19 degrees farther back than the season at the same node a little under a year earlier. A year has at least four and at most seven eclipses in all. Astrologers who read eclipses watch which house pair the axis occupies and whether an eclipse lands near a natal planet; this guide names none, and an astronomical almanac lists them.

A few minutes with two tools on this site is enough to see where the nodes stand against your chart.

1. Use the birth chart calculator to note your natal planets and angles by sign and degree, and whether the nodes are mean or true.
2. Open the current transits calculator and find the transiting nodes, using the same convention.
3. Compare the node degree with each natal planet. Look for any planet within 3 degrees of the North Node, the South Node, or either point 90 degrees away.
4. Work out the timing: the gap in degrees divided by 1.6 gives the months until the contact is exact.
5. Place the axis in your houses, read the pair as a topic, and ask what you actually notice over those months.

Sam is a constructed person with Libra Rising, whole-sign houses and natal Venus at 20 degrees of Gemini. Suppose the transiting mean North Node is at 27 degrees of Gemini. The gap to Venus is 27 minus 20, which is 7 degrees. At 1.6 degrees a month the node needs about 4.4 months to arrive (7 divided by 1.6).

With a 2-degree orb, the contact begins when the node reaches 22 degrees, which is 5 degrees away or about 3.1 months, and ends when it passes 18 degrees, 9 degrees away or about 5.6 months. The window lasts about 2.5 months. The South Node, at 27 degrees of Sagittarius, is opposite throughout.

In Sam’s chart Libra is the 1st house, so Gemini is the 9th and Sagittarius the 3rd. The node has been in Gemini for about 2 months (3 degrees divided by 1.6) and will leave in about 17 months (27 divided by 1.6). A reader might say Venus’s topics, values and relationships, meet beliefs and learning on one end and daily exchange on the other. That is a prompt for reflection; a node contact is not fate or a karmic obligation, and many people notice nothing dramatic.

A node contact is not fate or a karmic obligation, and mean and true node conventions can shift its dates by weeks.