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Their Sun in your 10th house
They cheer on your ambitions
In synastry, you place one person's planets into the other person's houses. When someone's Sun, who you are, falls in your 10th house, Calling, that part of them shows up in the part of your life about career, public image, ambition.
What it's like
When the promotion email lands, this person is the first person you want to tell. They tend to treat your goals as important, and your public face looks a bit more polished beside them.
The good
They believe in your big plans
The tension
Their view of your career may weigh heavily
The other way round: Your Sun in their 10th house
You back their ambitions
This person may find themselves talking about work when you are around. Your Sun in their 10th puts you in the front row of their career, cheering or quietly raising the bar.
About Sun
The Sun is your core self: the thing you're here to become and the energy you run on when you're most yourself. It's the sign you already know, but it's only the headline, not the whole story.
About the 10th house, Calling
The 10th house is your public life: career, reputation and what you want to be known for. It sits at the top of the chart, so it's what people see from a distance.