Two people who read everything, and neither one asks. By the rule of elements, Scorpio is water and Scorpio is water, and the rule approves this pair. Keep that in mind and read on, because the rule answers far less than it seems to.

Two Scorpios recognise each other before they speak. Neither finds the other too intense, neither asks for the conversation to stay light, and both take what they commit to seriously. For someone who spent their life hearing they were too much, finding someone who takes that as the baseline is a relief hard to put into words. And the loyalty is total: when this pair closes ranks, it closes ranks.

The table every magazine publishes is simple: fire matches fire and air, earth matches earth and water. It was not invented yesterday, and it has a geometric reason, signs of the same element sit 120 degrees apart, and allied elements sit 60 degrees apart. Those are the trine and the sextile, the two aspects that tradition calls harmonious. The compatibility table is the aspect table applied to a single planet.

It puts half the zodiac on each person's list, which already shows how little information that is. And it can be tested against the numbers. I drew a random sample of 600,000 pairs of birth dates between 1966 and 2025, using the same ephemeris that builds charts on this site, and asked: in the pairs the rule approves, do the other pieces follow along?

In the pairs the rule approves, the Moons match in 49.8% of cases; in the ones it rejects, in 50.0%. There is contact between one person's Sun and the other's Moon in 46.4% of both groups, and contact between Venus and Mars in 46.1% and 46.2%. Between the two charts there are, on average, 26.7 contacts in the approved pairs and 26.6 in the rejected ones.

The columns are the same. Knowing that the rule approves or fails your pair tells you nothing about the other person's Moon, nothing about desire, and nothing about how many contacts the two charts have. And 50.0% is exactly what a coin toss would give you.

That does not make the table false. It makes it small: it describes a trait of temperament, read from a single point on the chart. Using it to decide who to date is reading a book by its title's first letter.

The blind spot is that both watch and neither asks. Each one gathers signs for weeks, draws a conclusion alone, and acts on that conclusion, and since both are good at this and both get it wrong sometimes, the house piles up decisions made on assumptions. The fight is not loud: it is a withdrawal with a date attached. And since both know exactly where it hurts the other, when the fight comes, it comes with surgical precision.

What decides it is where the rest of the chart DIFFERS. Two Scorpios with Mercury in Libra and Mercury in Scorpio are not the same house: one can name the problem without naming it becoming an accusation, the other only speaks once they have already decided.

What usually unblocks things: ask instead of concluding. An explicit rule, before I act on what I worked out, I ask, settles most of what this pair suffers, because both are excellent readers and terrible checkers. And it is worth agreeing that what you know about each other stays out of the fight: both have too much ammunition, and whoever uses it once spends a year rebuilding what they destroyed in ten seconds. And it helps to have someone from outside, a mutual friend, a therapist, someone with no side. Two people who do not budge need a third voice, and it is the one thing that can undo a years-long standoff in an afternoon.

The element rule reads one thing only: the element. Each sign carries two other labels the table ignores, and in both cases they say more about the day-to-day than the element does. The modality, cardinal, fixed or mutable, is the way a person goes into a subject: cardinal starts it, fixed holds it, mutable changes it. And the ruler is the planet that gives the sign its vocabulary.

Scorpio is fixed and ruled by Mars; Scorpio is fixed and ruled by Mars.

Both are fixed, and it is the most stubborn version of the modality. Fixed does not give way and water does not forget, so this pair has no natural mechanism for closing things out: a standoff can last years without either one calling it. What resolves it is not conversation, it is a fact from outside, or one of the two deciding to drop the matter for good.

And both belong to Mars, the planet of will. A house with two wills like that has plenty of energy and no planet in charge of putting things in perspective: no Jupiter to find it funny, no Mercury to explain, no Venus to smooth things over. Everything here carries weight, which is wonderful in a crisis and exhausting on a Tuesday.

Notice what this pair does best, which almost nobody mentions: both can take the truth. Neither needs reality softened, and that opens up conversations almost no other pair can have, provided someone starts them.

There is one exception to "the table tells you nothing", and it comes down to pure geometry. Venus never moves more than 47.2 degrees from the Sun, it is an inner planet, and from Earth's point of view it stays tied to the Sun's light. Given your sun sign, your Venus can only fall in five signs.

So the distance between two sun signs decides the odds that both Venuses land in the same sign. Measured across the same 600,000 pairs:

When both are of the same sign, which is the conjunction, the two Venuses fall in the same sign in 24.3% of pairs; one sign apart, the semi-sextile, in 19.2%; two apart, the sextile, in 12.9%; three apart, the square, in 5.5%; four apart, the trine, in 0.8%; and five or six apart, the quincunx and the opposition, never.

Scorpio and Scorpio sit at 0° from each other, conjunction, and that puts this pair in the 24.3% band. The two of you may well have Venus in the same sign, and it is the one affinity your sun sign guarantees, at least a little.

Notice what the table does with the element rule: it cannot follows the rule. Pairs the rule fails come out on top of the list, and pairs it approves come out at the bottom. The Venus link is real, and it is geometric, and it is why the compatibility table sometimes seems to work. It works a little, and not for the reason it claims to.

Four pieces that change everything, and that no sun-sign table can reach:

• Each person's Moon. It is the way you feel, need and settle down, the piece that most decides day-to-day life together. It changes sign every two and a half days.
• The Ascendant. It changes every two hours and depends on the city. Two Scorpios born on the same day can arrive at a party in opposite ways.
• The house each one falls into on the other's chart. The same Venus in your house 5 and your house 12 is passion in one case and a private matter in the other. This layer needs both people's birth time.
• What each one has already lived. Age, past relationships and the timing of the meeting weigh more than any aspect, and none of it is in anyone's chart.

This crossing is what's called synastry, and it needs both people's date, time and city of birth. Comparing sun signs is what's left when you don't have that.

And the limit stated out loud still holds: astrology decides nothing for anyone, doesn't tell you to stay or leave, and doesn't replace conversation or therapy. It gives you vocabulary. A couple who discover that one Moon needs routine and the other needs novelty have gained a better question than they had before.

And the questions that come up most on this subject, with the short answer: