by Stefan Stenudd


Trine Aspects in the Complete Horoscope

Harmony Between Inner Powers in Classical Astrology

Trine in the horoscope.
The harmony of things well related,
working somehow to each others advantage,
a balance of things making good sense.

Trine aspectTrine is the aspect (special angle) where planets or other horoscope points are about 120 apart in the Zodiac circle.


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       The classical astrology meaning of a trine is that the powers involved are in harmony, so that they stimulate one another to increased activity and success. So, both sides of the trine are enriched by the aspect between them. It is not as strong an aspect as the conjunction and the opposition, but it still enhances the planets involved, compared to what their importance would be without that aspect. The closer the trine is to 120, the stronger the aspect is, and the more it enhances the planets involved.

       In some cases, there can be three or more planets or other points in a trine, if one or both sides of it has a conjunction. Of course, such a trine is even more important.


The origin of the astrological significance of the trine is from the Zodiac: it is the aspect that connects Zodiac signs of the same element (fire, earth, air, or water). Such signs have very much in common, so forces within them cooperate fine if they are connected in an aspect. Also, there is math in the aspect: the circle's 360 divided by three is 120.

Trines in the horoscope.
The Trines of the horoscope. Zodiac signs of the same element are in Trine aspects. Also the twelve Houses of the horoscope have trine aspects, as can be seen in the image.


There is no room here to describe all the possible trines and how they should be interpreted. Instead, see the keywords for the planets below, and you will probably figure out what their trines will signify. Also take into consideration the Zodiac sign each planet is in, which tells you more about the nature of that planet's influence — and even more so the Houses of the planets, which inform you of where in your life the trine is mainly active. Here are the keywords for the planets and other points that form aspects:

  • Sun   basic drive
  • Moon   longing
  • Mercury   curiosity
  • Venus   affection
  • Mars   aggression
  • Jupiter   luck
  • Saturn   duty
  • Uranus   contemplation
  • Neptune   fantasy
  • Pluto   catharsis
  • Ascendant, AC   attitude
  • Medium Coeli, MC   self-image

       For example, the moon in trine with Mercury means that your longing and your curiosity are in harmony, stimulating one another: when you are involved in one, the other is also stimulated. The House of the moon will tell you what you long for the most, and the House of Mercury will tell you what you are the most curious about.

       Here are the twelve Houses, and keywords for what part of life they describe:

1st House   Identity

2nd House   Resources

3rd House   Communication

4th House   Home

5th House   Pastime

6th House   Work

7th House   Partners

8th House   Unknown

9th House   Travel

10th House   Career

11th House   Ideals

12th House   Shortcomings

       So, the 1st House is always in trine to the 5th House, since one's personality is smoothly expressed in spare time activities. The 2nd House is always in trine to the 6th House, since one's personal resources are connected to and exploited in one's work, which is usually the main way to increase one's resources. And so on.

       Also the twelve signs of the Zodiac have natural trines, as mentioned and seen on the illustration above.

       Mercury and Venus never form a trine, since they are never more than 76 apart.

Native trines

Trines in a birth chart never change. They show characteristics that you are born with and will keep all through your life. Pay attention to what Houses they are in. That shows in what area of your life the trines mostly express themselves.

       Also, consider how long the trine lasted in the sky, at the time of your birth: Some come and go very quickly, so they are quite personal, whereas others (those of the outer planets) remain for years, so they are shared by a whole generation.

Transit trines

Transit trines are those formed by the planets up in the sky to the points in your complete horoscope chart. It happens twice during each planet's orbit around the sun — once when approaching the transited planet or point in your horoscope, and once when moving away from it. For example, every year the sun forms two trine aspects to each of the points in your horoscope, eight months apart. For the moon, this is done in just a month. The slowest planet Pluto takes 248 years to complete its orbit, so you may need to reach your eighties to experience its trine with each of the points in your horoscope, and it will only happen once.

       Here are the times it takes for the planets and other points to make one rotation around the Zodiac, in round numbers — from a geocentric perspective, ie. as seen from the earth.

  • Sun   1 year
  • Moon   1 month
  • Mercury   1 year
  • Venus   1 year
  • Mars   2 years
  • Jupiter   12 years
  • Saturn   29 years
  • Uranus   84 years
  • Neptune   165 years
  • Pluto   248 years
  • Ascendant, AC   1 day
  • Medium Coeli, MC   1 day

       The frequency of a transit trine decides how important it is in your life. So, Pluto causes big and lasting changes, whereas the moon does little more than influence your mood at the moment.


Progressions are aspects formed by imaginary movement of the planets and other points in the birth chart. They don't correspond to any actual movement of the planets. Therefore, they should be used with care. But many astrologers regularly consider progressions, so you may want to try it. I rarely do it, which is why I don't present it further here. Transits make much more sense to me.


Orb is the measure of what angle is to be regarded as an aspect. For transit aspects of any kind, I would not recommend an orb grater than 1, so that a transit trine is active when the transiting planet is 119-121 from the natal point. That usually takes more than a year for Pluto, but no more than about four hours for the moon.

       Be aware that some transit aspects return once or twice, because of the retrograde movements of the planets, as seen from the Earth. So, usually a transit passing is followed by a retrograde passing, and then finished with a third passing when the planet resumes its forward movement. That means the event triggered by the transit tends to announce itself, then seem not to happen, but then finish by happening pretty much as it was originally announced. That's how much in life works, because of this stellar rhythm.

     In the case of aspects in your complete native horoscope chart, orbs vary according to aspects. For the trine I recommend an orb of no more than 4, i.e. from 116-124, but there are astrologers that use as much as 8. You can also allow the orb to vary according to what planets are involved, but that should be done moderately.

The Aspects

Here are the major aspects in astrology, with links to the webpage of each:

The Aspects








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Aspects — the "why" of the horoscope


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Stefan Stenudd

Stefan Stenudd, Swedish author of fiction and non-fiction.

About me

I'm a Swedish astrologer, author and historian of ideas, researching ancient thought and mythology. My personal website:

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