WTF Fun Fact – Okta

An “okta” is a unit equal to 1/8 of the sky. Cloud conditions are measured in oktas, so the difference between “partly sunny” and “mostly cloudy” is just 1 okta. – WTF Fun Facts

Source: https://www.mentalfloss.com/article/56820/whats-difference-between-mostly-sunny-and-partly-cloudy

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