How to Calculate the Phase of the Moon - Amy "SailorHG" Wibowo
summary
Proves the moon-illumination formula from first principles using trig not handwaving, derives the visible fraction with the law of cosines and sines and ends at the explicit equation cosine formula: (cos θ + 1)/2, verifies it matches an existing JavaScript astronomy library, and builds a demo site using an interactive scroller — the Scroll Llama interactive webpage is desktop-only but functional. BubbleSort Zines is cited as the accessibility angle.
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