A few questions come up every time readers look at this aspect. Here are the direct answers.
Who feels it more in synastry? Both, in different roles: the Jupiter person supplies the encouragement and the Sun person decides what to build with it, as the synastry section explains. The Sun person's follow-through is what keeps the warmth from turning into pressure.
How strong is this aspect compared with related Jupiter contacts? A sextile is 60° and needs a small initial push; a trine is 120° and flows with even less effort. A conjunction, like Jupiter conjunct Fortuna, piles two themes onto one degree and lands louder. The related aspect reads linked below show how much the angle itself changes the story.
How strong is a sextile compared with a trine? A trine is 120° and flows with even less effort. A sextile is 60° and needs a small initial push. That push is the point. Sun sextile Jupiter gives the opening; you supply the initiative.
What if the sextile is exact? Exactness makes the theme louder and easier to spot. Recognition arrives more naturally through people, and the risk of overconfidence rises with it. An exact hit is a good time to schedule the concrete step, not to assume the result.
What if the orb is wide? A six-degree gap still counts for a sextile, but the effect is quieter. Treat it as a nudge rather than a headline. Take the step anyway, with less expectation that the boost will carry you far.
Which planet holds more weight? In a birth chart, the Sun describes what the person is and Jupiter describes where growth comes from. In synastry, the Jupiter person usually shows more visible energy, while the Sun person's choices decide the outcome.
What about the Sun in a Saturn-ruled sign such as Capricorn? The sextile still works, but you trust it slowly. Expect the help to arrive and then be audited. That caution is exactly the realistic self-assessment the aspect needs.
Does this aspect guarantee a promotion, a relationship or money? No. It marks an opening, and openings can be missed, mismanaged or spent on the wrong thing. Astrologers describe the pattern; you write the ending.
Do I need an exact birth time? For the signs and the aspect itself, no. For the houses and angles, yes. If the time is unknown, a noon chart is a useful working approximation, but its houses, angles and rising sign are not established facts.
What is the single best move? Find one person who already believes in you and ask them for one specific thing this week. A recommendation, an introduction, a reference. Sun sextile Jupiter responds to a named request far better than to a vague hope.
That is the aspect in one sentence: a door held open by someone's goodwill, waiting for you to walk through with a concrete step.