Fire and earth, awkwardly spaced
Earth wants the ground to stay where it is and fire wants to be somewhere else. Sagittarius reads Taurean steadiness as a refusal to live; Taurus reads Sagittarian appetite as an inability to sit down. Neither reading is generous and both are recognisable.
There is a useful trade underneath it. Sagittarius brings back experience that Taurus would never have gone looking for, and Taurus provides the base a wandering sign needs and rarely builds for itself. Whether the trade happens depends on whether each accepts the other is contributing.
Fixed against mutable
Modality is the sharper edge here. Taurus holds and Sagittarius shifts, and five signs of separation means there is no natural aspect softening the contrast. Nothing about the pairing is structurally supported.
The practical shape is familiar to anyone in it. Sagittarius proposes a change and Taurus does not refuse so much as decline to act, and the proposal dies of neglect rather than of disagreement. Sagittarius eventually stops proposing and starts going alone, which Taurus discovers after the fact.
Jupiter and Venus
Sagittarius is ruled by Jupiter and Taurus by Venus, the two benefics of traditional astrology. That is worth noting, because it means the pairing has a natural warmth and a shared taste for indulgence even where the temperaments conflict.
Jupiter expands and Venus consolidates, so the appetite is mutual and the disposal of it is not. Both enjoy good food, generous hospitality and spending on pleasure. What they disagree about is whether the money should have been kept. Where Jupiter and Venus fall in the two charts determines how expensive that disagreement becomes.
Where it grinds
Freedom of movement, stated plainly. Sagittarius will not be accounted for and Taurus regards knowing where its partner is as a basic condition. Neither position is unreasonable and neither is negotiable, so it returns in a different form every few months.
The second friction is bluntness about the home. Sagittarius says the house is dull or the routine is deadening, means it as an observation, and does not grasp that it has criticised the thing Taurus built its security out of. That remark is remembered.
Why the sun signs settle nothing here
Sun-sign comparison describes a tendency spread across a twelfth of everyone alive. Two people are not a tendency, and this pairing in particular ranges from workable to impossible depending on the rest of the charts.
Venus and Jupiter are the rulers and worth locating. Beyond them, the Moon tells you what each needs at home, which is the actual subject of the dispute, and Mars tells you how hard either will push. Those outrank the Suns comfortably.
Questions people ask about this
Can Sagittarius and Taurus last?
Some do, usually where the settled side accepts periodic absence and the restless side accepts a fixed base. Neither concession is small.
Do they have anything in common?
Appetite. Both rulers are traditional benefics and both signs enjoy comfort, food and generosity. The disagreement is about the bill.
What is the recurring argument?
Whether one partner has to be accounted for. It reappears in different forms because neither position is one either side can drop.
Which placements matter more than the Suns?
Venus and Jupiter as rulers, then the Moon for what each needs at home and Mars for how hard each will push.