Penombre
An offline planner for eclipses, golden hour and the night sky.
Penombre computes solar and lunar eclipses, sunrise and sunset, twilight, moon phases and the night sky for any place on Earth. Every figure is calculated on your own device from published astronomical algorithms — there is no account, no advertising and no tracking of any kind.
- Solar and lunar eclipse circumstances — contact times, magnitude, obscuration, and a map of the shadow moving across the Earth
- Golden hour, blue hour and every stage of twilight, with Sun and Moon azimuth on a compass
- Sunrise, sunset, moonrise, moonset and a moon phase calendar
- A sky chart of stars, constellations and planets, and a solar system you can turn — each planet with its own moons
- An exposure calculator — depth of field, field of view, and the longest exposure before stars trail
- A cloud forecast, so you know whether you will see any of it
The web version loading here is free and complete. The Android app adds reminders for sunrise, sunset, golden hour and dark skies.
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