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FAQ

Why does Lunaday ask for my location?

To compute accurate sun, moon, and tide times for where you are, and to find your nearest tide station. Your location is used on your device and never sent to the developer. Apple’s geocoding service receives it, rounded to about 1 km, to look up your city and time zone; NOAA receives only the ID of a nearby tide station or buoy (and, as with any web request, your IP address). If you turn location access off later, Lunaday deletes the location it saved. If you decline, moon phase and illumination still work — Lunaday just uses an approximate default location for the local sun, moon, and tide times until you allow access or choose a place by hand.

Where do the tides come from?

Tides work on coasts worldwide, as long as a tide station or gauge is near you. Near a NOAA station (mostly on U.S. coasts), Lunaday shows NOAA’s published predictions. Elsewhere, tides are computed on your device from TICON-4 tide constants for more than 3,100 gauges in 116 countries, with no network request, and are labelled “Computed.” Computed times are for planning, not navigation.

What's included in Lunaday+?

Lunaday+ is a one-time unlock (no subscription). It adds the full Sky Planner — the 30-day best-day timeline and tap-to-plan — plus a full year of sky events (full moons, meteor showers, and eclipses; the next three are free), today’s wave height and water temperature from the nearest NOAA buoy in U.S. waters, 16 calendar systems and a custom start of week, and Siri Shortcuts. Widgets, themes, and app icons are free. The free version keeps working forever.

Why does the dark-sky window sometimes say "none tonight"?

The dark-sky window is the time after astronomical dusk and before dawn when the moon is below the horizon — the genuinely dark stretch for stargazing. On bright-moon nights (near a full moon) there often isn't one, so the stargazing score is low. That's expected: Lunaday reports the real sky, not an optimistic one.

Are the "traditional almanac" tips scientific?

No — and Lunaday labels them as such. The moon and sun data are real, on-device astronomy, and the tide times are real predictions. The optional gardening guidance is folklore (traditional lunar planting), clearly marked "traditional almanac guidance," not a scientific claim.

Can I make the text larger?

Yes. Most of Lunaday’s text follows your device’s text size setting (Dynamic Type). A few tight layouts, such as the month grid and the widgets, stop growing at a large size so they still fit. The gold accent color meets WCAG AA contrast in light and dark mode.

Credits

Lunaday is a fork of Clendar, an open-source calendar by Vinh Nguyen (MIT License). Its sun and moon math is a port of SunCalc by Vladimir Agafonkin (BSD 2-Clause License), computed tides use the TICON-4 tide constants by Hart-Davis, Dettmering, and Seitz (CC BY 4.0), and the moon surface is derived from NASA Scientific Visualization Studio imagery. NASA does not endorse Lunaday. Full credits are in the iPhone Settings app, under Apps › Lunaday › Licenses.