Fire and earth at odds
Fire wants to move and earth wants the ground checked. Sagittarius makes the large claim and Virgo asks which part of it has been verified, and both are performing a useful function that the other experiences as obstruction.
Where the combination works, Virgo turns a Sagittarian scheme into something that can actually be done and Sagittarius stops Virgo shrinking the plan to whatever is certain. Where it fails, Virgo becomes a permanent source of objections and Sagittarius stops mentioning ideas in advance.
Two mutable signs
Both adapt and neither holds, so this is a flexible pairing that struggles to conclude anything. Plans get revised repeatedly, and each revision is reasonable, and the result is that decisions arrive late or by default.
The modalities also mean neither sign digs in for long. Arguments here are frequent and short rather than rare and severe, which is easier to live with than a stalemate and harder to point to when something needs to change permanently.
Jupiter and Mercury
Sagittarius answers to Jupiter, which enlarges, and Virgo to Mercury, which specifies. That is close to a definition of the pairing: one body makes things bigger and the other makes them exact, and each considers its own operation the responsible one.
Traditional practice regards these two as poorly matched, since Mercury's precision is at a disadvantage in Jupiter's signs and the reverse also holds. That is a statement about how the two work, not a verdict on any relationship. The placements in the actual charts decide the tone.
Where it grinds
Criticism against overstatement. Virgo corrects the detail and Sagittarius rounds up for effect, so a conversation about a factual matter becomes a conversation about honesty and about pedantry, neither of which was the original subject.
The second grind is tidiness and time. Virgo runs on routine and notices what has been left. Sagittarius agrees the routine is sensible and does not follow it, and the resulting imbalance is a common reason this pairing wears out rather than breaks.
Two birth months are not two people
A sun sign is shared by everyone born in the same portion of the year, which makes this description a broad tendency and nothing more precise than that.
The Moons determine whether the household rhythm suits both, which matters here because one sign is orderly and the other is not. Venus determines whether affection is offered in a recognisable form. Mars determines how the small frequent arguments actually land. Those are worth more than either sun.
Questions people ask about this
Do Sagittarius and Virgo argue often?
Frequently and briefly. Both are mutable, so disputes recur and pass rather than settling into a long standoff.
Why is Virgo hard for Sagittarius to live with?
Virgo corrects detail as a matter of course. Sagittarius rounds up for effect and hears the correction as an accusation of dishonesty.
Are Jupiter and Mercury opposed?
Traditional practice treats them as poorly matched, since one enlarges and the other specifies. That describes a tension, not an outcome.
What should I check beyond the suns?
The two Moons, Venus and Mars. Domestic rhythm is the recurring issue here, and the Moon governs it more directly than the Sun.