The short answer

Two who go, and the house nobody tidies. By the rule of elements, Sagittarius is fire and Sagittarius is fire — and the rule approves this pair. Keep that in mind and read on, because the rule answers far less than it seems to.

Two Sagittarians have fun in a way almost no other pair manages. Both laugh loudly, both say yes, neither holds a grudge and neither demands constant presence. For someone who has spent a lifetime hearing that they take nothing seriously, being with someone who finds that normal is a relief — and the two give each other freedom without it costing a negotiation.

What the element rule says, and what I measured

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?

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.

Sagittarius and Sagittarius in practice: where this pair gets stuck

The blind spot is anything that requires someone to stay put. The bill, the appointment, the conversation about the future, the house. Both put things off with the same ease and neither feels guilty, so the pending matter is not resolved by either of them — it gets resolved by the consequence. And the fight, when it comes, is big and short: both raise their voices, both exaggerate, and an hour later it is over. What does not pass is what nobody did.

What decides it is where the rest of the chart DIFFERS. Two Sagittarians with a strong Saturn and a weak Saturn are not the same house: one manages to pay the bill on the day, the other finds out about it when the power gets cut.

What usually unblocks things: outsource the boring part. An accountant, a direct debit, someone to manage what neither of you will manage — it is more honest than promising a discipline that will not exist. And it is worth marking on the calendar the few things that matter: two mutable signs keep an agreed date and keep no intention at all. And it is worth choosing, between the two of you, who is responsible for each thing that requires someone to stay put: without an owner, the task is not merely put off out of laziness — it simply does not exist for either of you. And it helps to have someone outside the couple with authority over the boring matter — an accountant, a manager, someone who chases it up — because two people who never chase each other up have no trouble obeying someone who isn't family.

What the element table doesn't look at in this pair

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.

Sagittarius is mutable and ruled by Jupiter; Sagittarius is mutable and ruled by Jupiter.

Both are mutable, and it is the combination with the least friction and the least sense of direction in the wheel. Nobody holds a position — so there is no deadlock — and nobody holds a direction — so there is no long-term project. This pair is often excellent for six months and lost within two years, not for lack of enjoying each other's company: for lack of someone saying «this way».

And both belong to Jupiter, the planet that magnifies whatever it touches. Two Jupiter people together exaggerate joy, promises, spending and generosity. It is wonderful to live and it has no brakes: neither of them is the planet that says «this doesn't fit» — and the job, left vacant, does not fill itself.

Notice something this pair has that is uncommon, and it is worth naming: the two of them truly forgive. It is not tolerance nor a strategic forgetting — it is a genuine inability to hold a grudge. This pair ends, when it ends, from practical exhaustion, almost never from hurt.

The one thing your sun sign decides about the other person

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:

Sagittarius and Sagittarius sit 0° apart — a conjunction — which puts this pair in the 24.3% bracket. 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.

What no sign table can reach

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 Sagittarians 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.

Frequently asked questions about Sagittarius and Sagittarius