Circular rainbow spotted by mountain climber

Circular rainbow
Sam Clack, 33, spotted the phenomenon from the highest peak in Wales. Photo: SWNS

A mountain climber experienced a jaw-dropping sight when he witnessed a full circular rainbow.

Sam Clack had spent four hours scaling the Mount Snowdon when he was met by the stunning spectacle.

Circular rainbow
Sam's shadow formed part of the rainbow's image. Credit: SWNS

What Sam saw is known as a Brocken Spectre, a rare phenomenon caused by the sun and his own shadow.

From behind him, the sun projected his shadow onto the mist below, creating the colourful, halo-like maze.

Sam Clack on the mountain
The phenomenon takes its name from the Brocken, a peak in the Harz Mountains in Germany where it was first identified. Credit: SWNS

It was Sam's lucky day - there was even someone on hand to explain the science behind it:

"I randomly met a retired physics teacher at the top, who managed to explain it when he'd lifted his jaw from the floor.

"I have never seen one before and may never see another, it was definitely a privilege to have witnessed it."