How to Read and Test Chart Patterns Without Getting Lost

With Venus at 4 Taurus and Saturn at 6 Cancer, Mars at 4 Sagittarius completes a yod with legs of 150 and 148 degrees, but moving Mars to 1 Sagittarius leaves the Saturn leg 5 degrees from exact and the yod fails.

This guide is about testing aspect configurations, small sets of planets joined by specific angles, such as a grand trine, a yod or a kite, so that you only name the ones that really hold. The overall shapes planets make around the wheel, such as a bowl or a bundle, and the basic list of patterns are covered in our guide to birth chart patterns explained for beginners.

People get lost because two hidden choices decide whether a configuration exists: the set of bodies you count and the orb you allow. Make both before you look and write them down. Then the same chart gives the same answer every time you check it, and a pattern is a tool for noticing emphasis, not a verdict.

The same chart can show a pattern with one set of bodies and none with another, so decide first and write the choice at the top of your notes. Common sets are:

• The ten planets from the Sun to Pluto, the most common choice and the easiest to compare between charts.
• The ten planets plus the lunar nodes, which some astrologers add.
• The ten planets plus Chiron and a few asteroids, which adds possibilities and noise together.
• Planets plus the four angles, used mainly when looking at configurations.

A configuration is only as strong as its loosest leg, so measure the leg most likely to fail first. The orbs below are one common convention, not a rule; use the figures you declared at the start.

Take a constructed chart with Venus at 4 Taurus (34 degrees) and Saturn at 6 Cancer (96). Saturn minus Venus is 62, a sextile with an orb of 2. A yod needs a third body about 150 degrees from both. Put Mars at 4 Sagittarius (244). Mars minus Venus is 210, and 360 minus 210 is 150, an exact quincunx. Mars minus Saturn is 148, a quincunx with an orb of 2. Both legs pass a 3-degree limit, so this is a yod with Mars at the apex.

Now move Mars to 1 Sagittarius (241). The Venus leg becomes 360 minus 207, or 153, an orb of 3, and the Saturn leg becomes 145, an orb of 5. Under the usual tight quincunx orb the yod is gone, even though the same gap would pass easily for a square or trine. That is why the yod is the pattern most often claimed and least often confirmed.

Take the Moon at 8 Aries (8 degrees), Jupiter at 10 Leo (130) and Saturn at 6 Sagittarius (246). Moon to Jupiter is 122, an orb of 2. Jupiter to Saturn is 116, an orb of 4. Saturn back to the Moon is 8 plus 360 minus 246, or 122, an orb of 2. That is a fire grand trine within 4 degrees.

Add Venus at 9 Libra (189). Venus minus the Moon is 181, an opposition with an orb of 1. Venus minus Jupiter is 59, a sextile with an orb of 1, and Saturn minus Venus is 57, a sextile with an orb of 3. Every leg passes, so the four bodies form a kite, with Venus as the focal point opposite the Moon.

Place the Sun at 5 Aries (5 degrees), Jupiter at 3 Leo (123) and Saturn at 11 Sagittarius (251). Sun to Jupiter is 118, an orb of 2. Jupiter to Saturn is 251 minus 123, or 128, an orb of 8. Saturn back to the Sun is 5 plus 360 minus 251, or 114, an orb of 6.

All three are in fire signs, but the triangle only closes if you accept an 8-degree orb. At 6 degrees it fails. The honest move is to say a loose grand trine, name the orb you used, and give it less weight than a tight one.

Resist the urge to read the shape first. Read each planet in it by sign and house, then read the aspects between them, and only then say what the arrangement suggests as a whole. In the kite above, Venus is the focal point, so the usual question is how a wish for balance and partnership (Venus in Libra) gives direction to the easy confidence of the fire trine.

In the yod, the apex Mars is the planet asked to keep adjusting between two bodies it shares little with. The question is where action has to be fitted, again and again, to the demands of comfort (Venus) and duty (Saturn).

Do I need a pattern in my chart? No. Many charts have none that pass strict tests, and a chart without a named pattern is not missing anything.

Can I have more than one? Yes, and they can share planets. Two overlapping patterns usually describe one theme from two angles, so combine them in one sentence instead of reading them twice.

Do the nodes and asteroids count? Only if you declared them in your body set. Adding them can create or break a pattern, so compare like with like.

Does a pattern outrank the houses and signs? No. It is one layer among several, and it should rarely carry more weight than the Sun, Moon and Rising sign.

Use this order when a chart looks crowded.

1. Write your body set and your orbs at the top of the page.
2. Check for oppositions within your orb, and look for a third body squaring both ends or a fourth body sextiling both.
3. Check every sextile for a third body about 150 degrees from each end, using the tight quincunx orb.
4. Check for trine triangles by looking for three bodies about 120 degrees apart.
5. Write one sentence about each pattern that passes, and discard any that need a wide orb to hold together.

Many charts have no pattern that passes strict tests, and adding nodes or asteroids can create or break one, so compare like with like.