Pluto: Its Discovery, History, and Meaning

2020 promises to be a year of big changes astrologically, culminating with a Jupiter/Saturn Conjunction, also known as a Great Conjunction, in Aquarius at the Winter Solstice. This will mark the end of a two-century era in which the Great Conjunctions fell in Earth Signs and the beginning of a new two-century era in which they will occur in Air Signs.

As if this were not enough, before Jupiter and Saturn can come together, they will both have had to cross the path of Pluto. Saturn closed in on Pluto on January 12, 2020, and Jupiter will meet with Pluto three times, on April 4, June 30, and November 12.

For a detailed discussion of the Transits of 2020, see 2020 – An Earth-Shattering Year.

While all astrologers agree that the Jupiter/Saturn Conjunction has great significance, what about the meaning of the conjunctions of both of these planets with Pluto?

Answers to this question will vary widely by who you talk to. A Modern Psychological Astrologer or an Evolutionary Astrologer will attach deep meaning to these transits, while a strict Traditional Astrologer might say that they have no meaning at all.

In order to examine this subject, it might be helpful to take a closer look at Pluto, its history, and the significance that has been given to it by astrologers.

The History of Pluto

Before we delve into the astrological and metaphysical meanings of Pluto, let us step back and look at what we know about the discovery of this planet, its demotion, and its current place in modern astronomy.

Clyde Tombaugh

Pluto’s Discovery

Pluto was discovered in 1930 by Clyde Tombaugh when he was 23 years old. He worked at the Lowell Observatory, and his job was to search for Planet X. A century had not yet gone by since the discovery of Neptune in the mid-1840s.

Apparently, in the late 19th century, some astronomers believed that the orbits of Uranus and Neptune were not what they were supposed to be and speculated that there was another planet causing the anomaly. This undiscovered planet was called Planet X.

Percival Lowell was a wealthy Bostonian and scholar who was interested in a variety of subjects, including mathematics and astronomy. He founded the Lowell Observatory, and searching for Planet X was one of his pet projects.

Percival Lowell did not live to see his dream become a reality, but one of the glyphs that is commonly used for Pluto has a combined P and L, which in addition to being the first letters for the name of the planet, were also the initials of his name.

Pluto’s Demotion

Beginning in the early 1990s, barely 60 years into its discovery, Pluto’s status as a planet was beginning to be called into question. Part of the reason for this is that astronomers were finding out just how small Pluto really is. It is about two-thirds of the size of the Earth’s Moon.

Pluto, compared to the Earth and Moon

Another difficulty is that Pluto’s orbit is quite messy. Like the asteroid belt between Mars and Jupiter, Pluto’s orbit is filled with other space objects and is now known to be a part of a region that has been named the Kuiper Belt.

Pluto’s final fall from grace happened when another body larger than it was found to be further out into the Kuiper Belt. This body eventually became known as Eris, after the Greek goddess of strife and discord.

In 2006, the International Astronomical Union (IAU) officially determined the definition of a planet to be a celestial body that 1) is in orbit around the Sun; 2) has enough mass to be round; 3) has cleared the neighborhood around its orbit.

Celestial bodies that have only met the first two criteria are now known as dwarf planets, and there are now 5 bodies that belong in this classification, among them, Pluto, Eris, and Ceres.

Pluto’s demotion was highly controversial. In his book, The Pluto Files: The Rise and Fall of America’s Favorite Planet, Neil deGrasse Tyson, the director of the Hayden Planetarium and one of the key players in Pluto’s reclassification, tells the story of the popular outcry. Apparently, Dr. Tyson received quite a bit of mail complaining about the demotion, which included letters from elementary school children. One letter even included a picture of Pluto crying.


Pluto’s Heart

It turns out that the elementary school children discussed above may have been right to be concerned about Pluto’s feelings. Unbeknownst to anyone, Pluto apparently has a heart.

In 2006, the space probe, New Horizons, was launched to explore the outer Solar System. This probe arrived at Pluto in 2015 and mapped this celestial body along with its largest moon, Charon. Charon is so large in comparison with Pluto that Charon does not actually orbit Pluto. Instead, these bodies orbit a point between them.

New Horizons sent back a great deal of data about Pluto. Some of the most interesting discoveries were that the most prominent feature of Pluto’s landscape is a large heart-shaped region and that there may be water beneath its surface.

Pluto in Astrology

Pluto’s role in astrology has also taken many twists and turns. At the present time, Pluto is just as controversial in the astrological community as it is in the scientific one. For the most part, Indian astrology does not incorporate Pluto or any of the modern planets, but for such a small celestial body, it has become a very big bone of contention among Western astrologers.

Below are some of the views of Pluto based on three of the main branches of Western Astrology.


Strict Traditional or Classical Astrologers ignore Pluto altogether. They also ignore Uranus, Neptune, and all of the asteroids. They primarily use the Seven Traditional Planets and see no need to make room for any of the planets discovered in modern times. This is, in part, because of the doctrine of visibility, which is that only the bodies that are visible have meaning to our lives.

Yet, there are many astrologers, some of them quite well-known, that use mostly traditional methodology and still incorporate Uranus, Neptune, and Pluto in their readings.

In general, though, these astrologers do not assign the planets the rulerships of any signs, and instead, stick to the traditional rulership scheme.

Modern Psychological Astrology

The most common branch of astrology that is practiced in the West can be loosely described as Modern Psychological. Actually, this is far from a unified or organized school of thought, but there are some common themes.

The reason it is often termed psychological astrology is that its primary purpose is to describe people’s personality traits and internal psychological dynamics. Often, practitioners do not try to predict events that will happen in people’s lives but instead focus on a person’s Free Will.

Planets and celestial bodies are often incorporated into the system shortly after they are discovered. Innovation is welcome and even encouraged by practitioners.

In Modern Psychological Astrology, Pluto governs deep internal psychological forces. The associations for Pluto are often quite dark, although, it is also termed the planet of “transformation.” Pluto is assigned the rulership of Scorpio, sometimes alongside Mars, the traditional ruler, and sometimes in place of Mars. Areas assigned to Pluto are the areas of the psyche are ugly, violent, and that most people try to keep buried.

On a global level, it has been noted that Pluto was discovered as we were discovering atomic power, and the element named for it, plutonium, was used in the first atomic bomb detonated in war.

Pluto’s demotion has not changed its usage by most Modern Psychological Astrologers, although some have included other dwarf planets, such as Ceres and Eris, into their readings.


Evolutionary Astrology

Evolutionary Astrology takes Pluto even further, teaching that it is central to a person’s soul. Indeed, it points to the soul’s karma and its intentions in this present life. One of the major schools of Evolutionary Astrology is known as The Pluto School.

This branch of astrology also combines a sign, its ruler, and the house whose number corresponds to that sign, and gives them all a synonymous meaning. In this system, Scorpio, Pluto, and the 8th House all mean approximately the same thing.

Interestingly enough, this system places a heavy emphasis on Free Will. The chart is just a reflection of your past up until the point that you were born, and you can decide what to do with it in this life.

Even so, in many cases, Evolutionary Astrology often takes a close look at the traumas and unpleasant experiences that one has encountered in this and previous lives.

Further Discussion and Research

Last spring, on the Astrology Podcast, hosted by Chris Brennan, there was an interesting episode titled How Did Pluto and the Outer Planets Get Their Meanings. The panelists were Chris Brennan, Kenneth Miller, Sam Reynolds, and Lisa Schaim.

You can watch this episode on YouTube here.

This was a very good discussion, and I highly recommend it.

One of the more interesting parts of this video was a discussion by Kenneth Miller about a study he conducted regarding the views of astrologers concerning Pluto since its discovery.

According to his research, for the first few decades, most astrologers were unsure of whether Pluto did have meaning and if so, what that meaning was. Sometimes it seemed to impact people and sometimes it did not.

In most cases, astrologers from the early decades of Pluto’s discovery seemed to think that Pluto was only relevant in a birth chart if it impacted other planets or chart points in the chart.

In modern times, however, Kenneth Miller observed that astrologers who use Pluto are convinced that it does have meaning, are confident of that meaning, and see evidence of its influence whether or not it is connected with the more personal planets.

In the episode, he pondered what that might mean, assuming that both the astrologers of the past and present astrologers were faithfully reporting their professional observations. Could it be that Pluto actually is more influential now than it was in the past?

Also discussed in this video was the practice of ascribing meaning to Pluto and other celestial bodies based on the name given to them by astronomers as well as by what was going on in the world during their discovery. The basis for this practice is the doctrine of synchronicity. One of the observations made, however, that there did not seem to be any discussion of the significance of Pluto’s demotion according to synchronicity.

Pluto and Free Will

One of the central controversies in astrology concerns the roles of Fate and Free Will in our lives. This is not just an abstract philosophical discussion. For astrologers, it has profound practical implications. Our position on this issue governs how much we think that a person’s astrological chart can tell us and what we believe that we are able to predict by the movements of the planets.

Ultimately, every astrologer must come to terms with this question for themselves, but the different branches of Western Astrology tend to have different beliefs the interplay between Fate and Free Will.

Modern practitioners of Traditional/Classical Astrology tend to fall heavily on the side of Fate. There are a few who go so far as to think that our entire lives can be predicted with mathematical precision from our charts. This is an extreme view and is not held by many practicing astrologers, however.

Astrologers in the Hellenistic Age seemed to have a more nuanced view and in general, believed that some things were fated and some were subject to Free Will. I have found that most modern Traditional and Classical Astrologers would agree with this. Yet, I think that almost all would say that Fate plays at least some role in what happens to us and that we can predict our present and our future to a certain extent from our birth charts.

On the opposite end of the spectrum are Evolutionary Astrologers who do not believe in Fate, but ascribe everything to Free Will. As discussed before, in this branch, our birth chart only reflects the choices that we have made in past lives. Our present and future paths are up to us.

Most Modern Psychological Astrologers fall somewhere in between these two extremes.

For my own thoughts on the subject, I refer the reader to the article below:

Fate, Free Will, the Cross, and Wa

One of the things that I have noticed is that it seems that there is a correlation between how much astrologers believe Pluto and the Outer Planets impact us and how great of a role Free Will plays in our lives.

I do not think that this is a coincidence.

Thoughts and Reflections

When I first read, The Feminist Universe, by Miss Alice Trent, I learned about the modern poisons of atomization, deracination, and deformation. Atomization separates us from each other, deracination separates us from our Source, and deformation twists and inverts that which is good and beautiful, making it an ugly parody.

If you are interested, you can purchase a copy of The Feminine Universe here.

When I was reading about these poisons, I was struck with how similar they were to the accepted meanings of Uranus, Neptune, and Pluto.


I wrote about my thoughts in the article below:

The Outer Planets – A Theory

In a later article, I discussed my thoughts on the notion that the Outer Planets were “Higher Octaves” of the Traditional Planets. The article is linked below:

The Outer Planets: the Pseudomythos of “Higher Octaves” and “Transcendence”

Based on these reflections, and in monitoring my own chart as the charts of my clients and others I know, I have developed my own practice as to how I use Pluto and the Outers.

I do believe that they can have an impact on people, but that this impact is almost entirely the result of Free Will.


I believe that the Traditional Planets, which we can see with the naked eye, cannot be avoided. We do have some Free Will with respect to how we interact with the principles they represent, but we are fated to deal with them as Axial Beings in the material world. For example, a mortal cannot avoid Saturn. We will all face the ravages of time and will eventually die.

We can, however, avoid delving into the depths of Pluto. In order to see it, we must go to substantial lengths and effort to do so. I think that is a metaphor for the Pluto principle as well.

On the other hand, no one is an island, and if our society has embraced Pluto, we will be impacted by it at some level whether we want to be or not. I find it interesting that there has been an outcry against the demotion of Pluto, and that many astrologers have ignored it completely.

If synchronicity was involved in its discovery, surely its demotion was meaningful as well. I think that, perhaps, we have been given the choice to reject the principles that have been associated with it. Maybe, over time, our society will be able to make that choice.


Perhaps, we can use this year of changes to stop employing Pluto as a symbol for the principle which encourages us to dig up parts of our psyche better left buried or to take apart the building blocks of matter giving the power to destroy ourselves. Instead, we can let it alone to be a teeny world at the edge of our Solar System. We can enjoy its dance with its partner, Charon, let it have its heart, and speculate about what might be in the oceans beneath its surface.

I think that we have that choice if we want it.

Author: Cynthia Thinnes

I am an Essentialist Astrologer and a housewife. I enjoy studying and discussing matters related to philosophy and religion. I also knit, crochet, and I am beginning to sew. I speak Japanese (although not very well), and I am studying Swedish, Latin, and Classical Greek. In addition to all of this, I am also learning about gardening. はじめまして。元型的な占星術師や主婦です。哲学を勉強しています。趣味は編み物や庭いじりです。下手でも日本語が出来ます。スウェーデン語もラテン語も古典的なギリシャ語を勉強しています。よろしくお願いします。

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