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A halo appeared in Singapore on Aug. 5, 2021 in the late morning and was visible in the sky for at least a few hours.

Yishun at around 10:30am:

Woodlands at about 12pm:

Jurong West at about 11am:

Why do halos appear?

Halos appear as they indicate high, thin cirrus clouds are present at 20,000 feet or more above ground level, which contain millions of tiny ice crystals, according to Earthsky.

The halos are created when light splits and reflects from these ice crystals, and only appear as a halo when the crystals are positioned with respect to your eye.

The phenomenon is also known as 22-degree halos as the ring has a radius of about 22 degrees around the sun (or even the moon).

According to the University of Illinois, this happens when sunlight enters one side of an ice crystal in the cloud and exits through the side at a 22-degree angle.

The bending of the light by 22 degrees from its original direction, produces a ring of light that is observed at 22 degrees from the sun or moon.

Such phenomenon happens occasionally in Singapore.

The last recorded instance was in September 2020.

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Top photos via Kelly Ong & Law Jia Bao