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Their Mercury in your 1st house
They put words to how you come across
In synastry, you place one person's planets into the other person's houses. When someone's Mercury, how you think, falls in your 1st house, Self, that part of them shows up in the part of your life about identity, body, how you come across.
What it's like
A throwaway comment from this person about how you seem, and suddenly you see yourself differently. They're quick at describing you back to yourself, accurately and sometimes cheekily.
The good
They describe you back to yourself well
The tension
Offhand remarks about you can sting more than meant
The other way round: Your Mercury in their 1st house
You help them find the words
Your Mercury in this person's 1st sharpens how they present themselves. Around you they get chattier, funnier and a bit more honest about who they are.
About Mercury
Mercury is your mind in motion: how you take things in, talk, text, plan and argue. It's also the planet of errands, emails and that list on the back of an envelope.
About the 1st house, Self
The 1st house is your front door: the first impression, the way you walk into a room and the body you do it in. It's how you meet the world before anyone's had a proper conversation with you.