Hi Product Hunt! 👋 I built Aphélie entirely from my iPhone — no computer involved. It started with a simple frustration: every app told me the sun sets “around 9:20 pm”. As a sky lover, I wanted the exact second — for golden-hour photos, for astronomy, for the sheer beauty of precision. Aphélie computes sunrise, sunset, solar noon and the three twilights (civil, nautical, astronomical) to the second, for 7,324 cities or any GPS coordinates — NOAA solar algorithm. It shows how much daylight you gain or lose each day, compares two places side by side, and works offline once loaded. It installs straight from the browser (iPhone, Android, desktop) — no App Store. €0.99, one single payment. No subscription, no ads, no account, no tracking. Free preview, no sign-up: https://aphelie.neocities.org/es... It’s the second app of Hélie, my one-person publishing house devoted to the sun, weather and climate. I’d love your feedback — features, design, use cases I haven’t thought of. Everything helps! ☀️

Aphélie

The sun, to the second — sunrise, sunset & twilights

The sun, to the second — sunrise, sunset & twilights