gold ring
A ring made of gold; a straightforward compound of 金 (gold) and 環 (ring).
彼女は指に金環をはめていた。
She wore a gold ring on her finger.
Astronomy term for the sun's corona, especially during a total solar eclipse. Often used in compounds like 金環食 (annular eclipse).
金環食では、月の周りに金環が見える。
During an annular eclipse, a corona is visible around the moon.
annular eclipse
annular solar eclipse
Compound of 金 (gold) and 環 (ring). The astronomical sense is a semantic extension from the ring-like appearance of the corona.