Yeah they seem to have drawn it as a dark circle going across for some reason.

But earth's shadows aren't what create moon phases IRL. The real moon phases are from the sun lighting the moon from different angles so this is just super weird.

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andreareina 2 days ago | parent [-]

Some reason probably being that it's easier

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noduerme 2 days ago | parent | next [-]

yet an incredibly basic and stupid oversight when the only point of your site is to show the phase of the moon.

I'm voting that this was vibe-coded by an LLM on behalf of someone who not only didn't write the code but didn't bother to look at a picture of the moon or look at the sky before deploying it. If so, it's almost the perfect Platonic example of "what could possibly go wrong?"

	▲	bstsb a day ago \| parent [-]
		in this case the code is publicly available on github and it doesn't have any obvious hallmarks of LLM generation. (for example the comments are all capitalized, there's inconsistent indentation)

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kingstnap 2 days ago | parent | prev [-]

The math isn't that bad if anyone wants to do it properly.

Assume y vertical and x horizontal and z out of the page.

The moon is a disk. x^2 + y^2 <= R^2

For all the points, calculate z = sqrt(R^2 - y^2 - x^2)

Let the vector v(theta) = <sin(theta), 0, cos(theta)> point to the Sun.

Points <x,y,z> • v(theta) >= 0 should be bright, The rest dim.

	▲	JdeBP 2 days ago \| parent [-]
		Now achieve that when your implementation constraint is that you're using JavaScript to style a <div/> element. (-: * https://github.com/Sean-93/asciimoon/blob/main/src/component...