Extending or occurring around the horizon; surrounding or circling the horizon line.
From Latin 'circum' (around) + 'horizontal' (from Medieval Latin 'horizont-' meaning the circular line where earth meets sky). Used primarily in astronomy and atmospheric optics since the 18th century.
A 'circumhorizontal arc' is a rare optical phenomenon—a brilliant rainbow-like arc that circles the sky horizontally instead of making the traditional arc shape! It only happens when the sun is at a specific angle and ice crystals align perfectly, making it a delightful reward for patient sky watchers.
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