You'll find time loses importance once you no longer have to manage it.
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Mammals have to breathe, so they are surfacing from time to time… so roughly they’ll know day from night.
Tides are mostly noticeable near land.
So you have deep sea creatures away from shore. They mostly won’t care about day and night as there’s no difference, with light not penetrating more that about 200 feet.
So below 200 feet, and away from shore you mostly can’t. But also it would not matter as there’s no difference
But if you were a human, in a submarine or a diving vessel where you needed to know, a clock or radio… would be about the options
Not all care, but it still impacts them.
Beyond this, the diurnal cycle does filter down into the disphotic zone and does influence species. It does weaken with depth.
This sounds like a good way to keep track of time.
Oh hell yeah!
Neat thank you!!
And I learned a new word
Zeitgebers are external cues, such as light, that synchronize the circadian clock in organisms with the Earth's day-night cycles.
A reverse clepsydra: an air-filled container that releases bubbles at a constant rate.
If I were an Intelligent sea creature I would just use my waterproof watch but idk about others
For simplicity, I'd ask the closest crab wearing a watch. Otherwise, I'd watch the tide bubbles and see if they are traveling east or west.
The tides?
Shadows can still cast underwater, so you could use a rock as a sundial or just how light it is at a certain depth.
How many up downs of my flip flop.
Wtf would I care? It's not Like I'm gonna have have office hours. Hungry? Dinner time!