Soluna: Moon Calendar

Every tradition that kept a calendar kept it by the sky: a day begins at sunrise, a month at the new moon, a year turns at a solstice. Sacred Calendar computes all of it for wherever you are, on the device, with no network.

THE SUN AND THE MOON
Sunrise, solar noon, sunset, day length and all three twilights. The Moon's phase as it looks tonight, its illumination and age, moonrise and moonset, its distance with the next perigee and apogee, and the next new and full moon to the minute.

A MONTH AT A GLANCE
A month grid with the phase on every day, a mark on each solar term and festival, and a second calendar in its own script. Tap a day for its sun, moon, term, festivals and its date in every calendar.

FESTIVALS OF SIX TRADITIONS
55 feasts computed from each tradition's own rule: Jewish, Islamic, Chinese, Christian (Western and Orthodox Easter), the Wheel of the Year and the first full moon of spring. Pick the ones you follow.

THE MOON IN THE ZODIAC
Its sign and next ingress, the void-of-course Moon, the 27 nakshatras and the 28 Arabic lunar mansions.

FULL MOONS, ECLIPSES, THE CRESCENT
Every full moon by its traditional name, Blue Moons and supermoons, the year's eclipses and whether you can see them, and new-crescent visibility by Yallop's criterion.

THE 24 SOLAR TERMS
The jieqi of the East Asian year, each with its Chinese character, for any year.

FOUR CALENDARS, ONE DATE
Gregorian, Julian Day, Islamic, Hebrew and Chinese, each in its own script: Arabic numerals, Hebrew numerals written correctly (ט״ו and ט״ז for 15 and 16), Chinese day counting from 初一.

TODAY'S SKY AND A JOURNAL
A short reading of the day, and one note a day stamped with the sky it was written under.

NOTIFICATIONS AND WIDGETS
Alerts for phases, terms, eclipses, the Moon's sign and festivals: at the moment, an hour before or the evening before. All off until you switch one on. Four home-screen widgets, including a countdown and the whole month.

SIDEREAL TIME
Local and Greenwich sidereal time and the running Julian Day.

YOUR PLACE, NO LOCATION PERMISSION
Pick from about 730 cities or type coordinates. The app never reads your position; the only permission it asks for is notifications, when you turn one on.

OFFLINE, ALWAYS
Everything is calculated, nothing fetched. No account, nothing uploaded.

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