How to Calculate the Phase of the Moon

[kawera]

http://witchy.co/trig/

[huhtenberg]

Illustrations like this one only serve to muddy the waters - http://witchy.co/triangle.png

The moon is lit from the wrong side and it has a crescent shape in what's basically an overhead projection. And it's not like there's much else going on in the illustration, it's one of its main elements.

[alanbernstein → huhtenberg]

You're not wrong, and for the amount of effort put into this presentation, I'm surprised at this oversight. But if you can think of this image as a schematic, it's not a huge problem.

[dvh]

Some time ago I calculated moon phase for date of birth for 90k users and I found no correlation.

[nurettin → dvh]

I calculated gpa vs. date of birth, there is a very slight skew towards post-july being more apt in terms of gpa.

Not sure if significant.

[jakeinspace → nurettin]

That would imply a student being towards the upper end of the age cut off for starting kindergarten/elementary school (in the US at least, varying by state).

[chrisseaton → dvh]

If you calculated the moon phase from the date of birth how is it possible that the two are not correlated?

[dvh → chrisseaton]

I didn't found higher birth rates for any of the phase (split into quarters)

[8bitsrule]

9K of Javascript to handle common Sun, Moon calcs: https://github.com/mourner/suncalc

[thisacctforreal → 8bitsrule]

Fwiw it's 9KB, not 9K SLOC.

[delinka → thisacctforreal]

Is this a common misconception? Personally, I assume KB in the context given.

[NamTaf]

The initial diagram showing new/half/full moon goes off my screen, presumably because I'm at 150% desktop zoom and it possibly somehow gets confused by that?

Also the feedback about the wrong side being illuminated.

[ngcc_hk]

Very hard to read on my iphone

[skilled]

The font seems to have an extremely strong glare effect in combination with other colors on the page.

[andai → skilled]

The font is made of sublimated astral magick.

[bernardv]

Very nicely done.

[nicky0 → _ofdw]

I dunno, why do people insist on reading websites on mobiles? :)