Sunfall
Golden hour, sun and moon. For iPhone.
Sunfall tells you when the good light happens where you are, where on the horizon it will come from, and what the moon is doing once the sun has gone.
Coming to the App Store
What it does
- A 24 hour sky ribbon you drag through time, where the sun's path flows straight into the moon's.
- Golden hour and blue hour, morning and evening, with durations.
- Rise and set bearings, so you know which way to point the camera, not just when.
- The moon: altitude, bearing, phase, how much is lit, moonrise and moonset.
- Civil, nautical and astronomical twilight, for the nights you are chasing real darkness.
- Any place, any date, shown in that place's own local time.
It works with no signal
Every time in Sunfall is computed on your device from the NOAA solar position algorithm and the standard lunar theory. There is no Sunfall server and no account. Searching for a place by name uses Apple's geocoding service; everything else, including every calculation, works with no connection at all.
The solar engine was validated against an independent reference across ten cities from the
equator to Anchorage, and the lunar engine against JPL ephemerides to better than a
fiftieth of a degree. Sunfall correctly reports when the sun never rises at all.
Privacy
Your location is used on your device and never transmitted, stored remotely, or shared. No analytics, no tracking, no account. Read the privacy policy.
Contact
Questions, bugs and requests go to hello@sunfall.app.