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29 September 2011

Weather Observation: Despatch (27 September 2011)


Johann Pretorius of Despatch took the above image which reflect a halo around the sun.

Now what does a ring around the sun mean?

In folklore, a ring (often called a halo) seen around the sun or the moon means precipitation (usually rain) is coming.

The ring is caused by sunlight or moonlight being diffracted as it passes through cirrostratus clouds that are usually at altitudes above 20,000 feet. Cirrostratus clouds are composed mostly of small ice crystals that spread out into a thin layer. They are sheet-like, and the sun and moon can be seen through them easily.