this post was submitted on 22 Aug 2026
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The bit about the ocean being blue because it reflects the sky is unfortunately mostly wrong. Water is slightly more blue than ozone, so the more of it there is (big water in big ocean) the more blue it will look. The fact that it's also reflecting the blue sky adds to the color, but on a cloudy day the ocean is still blue.
I'm about a kilometer from the ocean right now (I'm standing in front of the window through which I can see it), and it's a partly cloudy day. When the sky is clear (as it was five minutes ago), the ocean is a rich, saturated blue or even teal. When it's cloudy (as it is currently), I can see that it's a cool gray color. I might call it a very dark, desaturated cyan at most. So from my observation it has to be the opposite: the relative blueness of the ozone and the water must be the less dependent factor, and the color of the sky the more dependent one.
It's tricky, though. I guess I might be in a place with weird salinity or plankton or something.