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:

Transcript will show once it’s been added to explainxkcd.com

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

explainxkcd for #3135

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[–] shalafi@lemmy.world 51 points 2 weeks ago (14 children)

Been trying to learn about the tides around here so I can tell what I'm seeing on the water. Imagine my joy when I found a Casio, which I collect, with tide and moon phase indicators!

And that's when I learned the Gulf Coast is strange, has diurnal tides (twice a day) the watch can't predict. Took me an hour and a half to figure out it would never function. The moon phase works!

[–] Deebster 14 points 2 weeks ago (3 children)

the Gulf Coast is strange, has diurnal tides (twice a day)

Diurnal tides are once a day (semidiurnal is twice a day). By the Gulf Coast, I guess you must mean the Gulf of Mexico. I'm living on the other side of the world in the other diurnal region, so I assume our tides are synchronised!

[–] Tja@programming.dev 7 points 2 weeks ago

Gulf of America, you extreme left Antifa socialist!!1!one

[–] shalafi@lemmy.world 4 points 2 weeks ago

No idea how I got that backwards. I even looked it up before posting!

[–] Alcoholicorn@mander.xyz 2 points 2 weeks ago

Diurnal bros! Theres's dozens of us!

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