What does a circle on the sun line mean?

Short answer: A circle on the sun line usually means concentrated attention around visibility, recognition, reputation or creative talent. First confirm it is a true circle, not an island or dot.

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Read my palm
Palm skin seen very close, with small crossing creases and a tiny island

What this means

Check that the mark is a small closed round shape touching the sun line under the ring finger.

A clean circle may point to a focused public or creative theme, while a distorted circle near breaks or cuts can feel more like pressure around visibility.

Compare the line before and after the mark, plus nearby dots, moles, islands, the fate line, head line and both hands.