Lunaday: moon, tide calendar

Lunaday turns the moon into a planner. See each day's real moon phase and illumination, moonrise and moonset, sunset and astronomical twilight, and the genuinely dark window for stargazing — all computed on your device from real astronomy.

PLAN BY THE SKY • Tonight at a glance: phase, % illuminated, moonrise/set, and tonight's dark-sky window. • Sky Planner (Lunaday+): a 30-day timeline that highlights the best days for what you do — stargazing on the darkest, moonless nights; bright-moon evening hikes; moonrise-at-sunset photography. • Upcoming sky events: named full moons, meteor-shower peaks, and eclipses — with badges right on your calendar. • Tap any day to jump your calendar there and create an event. • Natural language: type "stargaze on the next new moon" and Lunaday finds the date.

TIDES & SURF (U.S.) • Next high and low tide for your nearest U.S. station, from official NOAA predictions. • Live wave height, period, and water temperature from the nearest NOAA buoy (Lunaday+, today's conditions).

WIDGETS • Home and lock-screen widgets show the current phase, illumination, and "new moon in N days."

HONEST BY DESIGN • Lunaday leads with real, on-device astronomy — no horoscopes, no predictions. Optional traditional almanac notes (like full-moon folk names) are clearly labeled as folklore, not science.

PRIVATE BY DEFAULT • No accounts, no tracking, no analytics. Your calendar stays on your device. Network is used only to fetch public NOAA tide and buoy data, and to look up a place name when you set a location.

LUNADAY+ LAUNCH OFFER Lunaday+ is currently a one-time purchase — yours forever, no subscription. It unlocks the full 30-day Sky Planner, a year of sky events, live swell and water temperature, Siri Shortcuts, and calendar options (16 calendar systems, custom start of week). As live-data features arrive, new buyers may move to an annual plan — early supporters keep everything.