Free tool · tropical zodiac · ten bodies · checks degrees, not element labels
Grand trine calculator
A grand trine is three planets that are each about 120° from the other two, so all three pairs are trines. Three planets in signs of the same element aren’t enough on their own: the degrees have to fall within the allowed orb. This calculator checks the actual degrees in your chart and shows all three edges of any triangle it finds. It needs a recorded birth time.
Example: a fictional chart
This is Lunara’s invented sample chart, not your chart or a real person’s: 1 January 1990, 12:00, London, the same fictional chart as the sample reading.
It has 12 major aspects between the ten bodies, but only one of them is a trine, so there’s no grand trine. Plenty of aspects don’t add up to a triangle: a grand trine needs three planets with all three pairs in trine at once. The aspects calculator lists all 12.
Check your chart
Your details are used to calculate this chart and aren’t saved or added to the page address. If you choose to buy a reading, the details needed to write it are stored with your order.
What counts as a grand trine here
Three different planets, with each of the three pairs counted as a trine: about 120° apart, within the orb. The calculator checks degrees, not the element of each sign. So three planets in water signs can miss if one pair is too far from 120°, and a triangle can cross elements when a planet sits near the edge of a sign.
Lunara’s chart allows 5.8° either side of 120° for a trine, 7.3° when the Sun or Moon is one of the pair and 5.3° when Uranus, Neptune or Pluto is (with both, the two adjustments combine). These are this site’s settings, not a universal rule. Other sites use different orbs, and some include points such as the nodes, which is why results can differ.
A different three-planet pattern, one sextile plus two 150° quincunxes to a single apex planet, is checked by the Yod calculator. For the tenser pattern, an opposition with a third planet square to both ends, use the T-square calculator.
A prompt, with or without one
Astrologers often read a grand trine as ease: things that come without much effort. Easy can also mean unused. Whether or not your chart has one, pick one thing you find easy, and one small action you’ll actually take with it this week. That’s the whole exercise. A triangle in a chart doesn’t decide talent, luck or how your life goes.
Read more: birth chart aspects calculator · how to read a birth chart.
Frequently asked questions
- Are three planets in fire, earth, air or water signs a grand trine?
- Not necessarily. Same-element signs are 120° apart as signs, but the planets’ degrees decide. One planet at 1° Aries and another at 29° Leo are almost 150° apart, too far for a trine.
- Can a grand trine cross elements?
- Yes. Because an orb allows a few degrees either side of 120°, a planet late in one sign can make a trine to a planet early in a sign of a different element. This calculator checks degrees, so it counts those too.
- Why does another site show a different result?
- Sites use different orbs, and some include points such as the nodes or Chiron. A triangle near the edge of an orb may appear on one site and not another. This page uses Lunara’s chart settings and only the ten bodies.
- What if I don’t have one?
- It doesn’t mean anything is missing. Your planets still form other aspects, and the prompt below works without a grand trine.
Method: Lunara’s central Swiss Ephemeris calculation, tropical zodiac, geocentric. Grand trines come from the same pattern detection as the free birth chart, limited here to triangles of Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto; nodes and Chiron are left out. Each edge is a trine from the same aspect calculation. Text written with AI assistance. A grand trine is a symbolic pattern in astrology, not a measure of talent, luck or how your life will go.