Why does the photographic aperture often say cloudy and sunny 16? Isn't the sharpness of 8 better than 16?

One of your wrong concepts, aperture has nothing to do with sharpness.

Aperture is related to light quantity and depth of field.

On a cloudy day, the light is not very strong and the sun is not big. Therefore, if the aperture F8 is large, there will be more light entering.

The weather is clear and the light is good, so it is unnecessary to explain F 16.

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I hope the answer can help you. If you have any questions, you can ask.

Of course, adoption is also your virtue, thank you.