Earth twice over
Both parties are practical, so the ordinary business of a shared life is handled without argument. Neither has to be persuaded that a task matters and neither leaves it to the other on principle.
What a doubled element leaves out is everything else. Nothing here supplies impulse, detachment or unguarded feeling, so the pairing becomes very good at maintenance and poor at pleasure. Both are likely to describe themselves as busy rather than unhappy, which delays the point at which either notices anything is wrong.
Mutable on both sides
Virgo is mutable, which means it adjusts rather than initiates. Two adjusters produce a relationship that responds well to circumstances and rarely chooses any. Large decisions about where to live or whether to have children are approached analytically and deferred.
The compensation is that neither entrenches. Arguments here are detailed and short, and neither party holds a position for the sake of holding it, which spares this pairing the deadlock that afflicts fixed combinations.
Mercury against Mercury
Both charts answer to Mercury, so both people analyse continuously and both trust analysis over instinct. That is a lot of scrutiny in one house with no one exempt from it.
Mercury also governs worry. Doubled, it produces two people examining the same problem from slightly different angles and confirming each other's anxiety rather than reducing it. Where each Mercury sits, and what it aspects, decides whether this is a partnership of competence or a shared nervous condition.
Where it grinds
Correction as a love language. Both notice the flaw and both mention it, meaning well, and the accumulated effect is two people who feel permanently under review by someone whose judgement they respect.
The second friction is self-criticism turned outward. Virgo holds itself to a standard it cannot meet, and living with a second person who does the same doubles the atmosphere rather than relieving it. Neither is willing to be the one who says the standard is unreasonable.
A shared sun is a narrow fact
Two people born under the same sign share a working method. They do not share a temperament, a history or a set of needs. One Virgo with a Leo Moon wants an audience; another with a Capricorn Moon wants to be left alone, and no sun-sign account distinguishes them.
Sun-sign matching sorts an enormous population into categories. The Moon, Venus and Mars in both charts, and the contacts between them, are where the description narrows to two people, and that is the comparison worth making.
Questions people ask about this
Do two Virgos criticise each other constantly?
Both notice flaws and both mention them helpfully. The intent is not hostile, but the accumulated effect is a sense of permanent review.
Is this pairing efficient?
Very. The practical side of a shared life is handled without dispute, since neither partner has to be persuaded that a task matters.
What does doubled Mercury do?
It doubles the analysis and the worry. Two people examining the same problem tend to confirm each other's anxiety.
What should we look at beyond the sun?
The Moon in each chart, which sets what each needs privately, then Venus and Mars, and the condition of both Mercuries.