Day-to-Milky-Way Holy-Grail Timelapse 14-EV Exposure Ramp & Interval Calculator

Deterministic Solar depression-angle twilight illuminance curve (-18 deg astro) + NPF star-trail max shutter constraint + ISO/shutter ramp engine (.pdf, .csv, .json) built for LRTimelapse, Syrp, Sony Alpha, Nikon Z — zero-upload ephemeral Wasm RAM execution.

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