this post was submitted on 30 Aug 2025
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xkcd #3135: Sea Level

Title text:

They're up there with coral islands, lightning, and caterpillars turning into butterflies.

Transcript:

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Source: https://xkcd.com/3135/

explainxkcd for #3135

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[–] infinitesunrise@slrpnk.net 57 points 2 weeks ago* (last edited 2 weeks ago) (2 children)

Huh. TIL that there are three common types of tidal cycles and which one you get depends on geography, location, ocean currents. https://beltoforion.de/en/tides/tidal_cycles.php

And yeah, dinural is apparently the most rare of the three. Wild.

[–] Successful_Try543@feddit.org 8 points 2 weeks ago (1 children)

Thanks. I didn't know either that there are places, where the sea level does not rise and fall twice a day.

[–] MarieMarion@literature.cafe 2 points 2 weeks ago (1 children)

I was reading Circe, by Madeline Miller, and on several pages some ancient Greeks wait for the tide to sail away, or watch the sea rising while waiting for Odysseus, and so on. Like, woman, did nobody notice at your publishing house?

[–] Wiz@midwest.social 4 points 2 weeks ago