✦ zenith calendar · the celestial almanac
moons, eclipses, solstices and meteor showers in one quiet layer of your sky.
celestial is one of the sky almanacs that come with zenith calendar, and it is there from the first open. it holds the new and full moons, the eclipses of the sun and moon, the equinoxes and solstices, and the peaks of the great meteor showers.
its moments were worked out once, before the app shipped, and checked against published tables to within a few minutes; nothing is worked out on your phone. each one shows on the day it falls where you are.
astronomical · exact moments, shown on the day they fall where you are
a meteor shower's peak, on the same date every year
one of the yearly meteor-shower peaks the almanac holds, from the quadrantids in january to the geminids in december.
the showers are yearly repeats on fixed dates, so they sit on the same day of the ring every year.
every full moon, at its exact moment
the almanac holds two phases only, the new moon and the full moon, each at its exact moment.
an all-day entry on the day the moment falls where your phone is, with its exact time on its own page. dated by universal time here, so where you are it can fall a day either side.
the solstice, named by its month
the equinoxes and solstices are named by month, "march equinox" to "december solstice", so they read right in both hemispheres.
kept as the exact moment of the solstice and shown on the day it falls where you are; dated by universal time here.
an eclipse, at its greatest point
the almanac holds solar eclipses, lunar eclipses and penumbral lunar eclipses, each at the moment of its greatest point.
an all-day entry on the day that moment falls where your phone is, with its exact time on its own page; dated by universal time here.
zenith calendar draws the year as an orbit round the sun. lit, celestial puts its moments on their days on that ring, in lilac. its mark is ☾, the crescent moon.
each entry is kept as its exact moment and drawn as an all-day entry on the day that moment falls where your phone is, with its exact time on its own page.
the moon drawn on the year, the week and the month is worked out from the date as it is drawn. eclipsing celestial does not take the moon off the calendar, and celestial never rings.
celestial arrives locked, so nothing in it changes by accident. the lock guards your hand, not your eye: tap its chip in the legend to eclipse it (kept, but not drawn) and tap again to shine it. one tap unlocks it, and then it is yours to rename, recolour or add to.
celestial shares one sky with your own commitments. like every almanac that comes with the app, it never counts toward the almanacs you can make for free, and it lives on your phone: zenith calendar has no server of its own.
✦ zenith calendar · the sky around it
celestial is a single layer. beneath it is a whole calendar drawn as the sky, your year an orbit round the sun, and every part of it answers your touch.
the sun stands at the centre and the year rings round it, with today's earth riding at today's place, its small moon beside it. tap the ring anywhere else and a faint ghost earth waits on that day.
drag along the ring and the days pass under your finger, the big date and the day's list following as you go. lift, and the day you stopped on stays picked.
tap the small moon beside today's earth and you dive into the week. the moon above shows its phase, named underneath; swipe the dates and each week brings its own.
tap the sun and the ring tips on its edge into a ladder of years. in the week, pull the moon firmly down and the month opens, the moon resting half off its foot.
zenith calendar has no server of its own. tap the gear and switch on "nothing comes in" or "nothing leaves this phone"; lift them, and every almanac is back exactly as it was.
celestial is waiting in the app, and the rest of the sky comes with it.
celestial (the sky's own events) ·
The next full moon falls on 26 October 2026 by universal time. Zenith Calendar shows it on the day that moment falls where your phone is, with its exact time on its own page.
The December solstice falls on 21 December 2026 by universal time; where you are it can fall a day either side.
The next solar eclipse in the celestial almanac falls on 6 February 2027 by universal time, at its greatest point.
The celestial almanac marks the Orionids peak on 21 October and the Geminids peak on 13 December, on the same dates every year.
Zenith Calendar for Android comes with an almanac called celestial: new and full moons, eclipses, equinoxes, solstices and meteor-shower peaks, drawn on the ring of your year beside your own days. It costs nothing.
No. The celestial almanac never rings; it is there to be seen on the ring of your year.
They were worked out once by the calendar's own astronomy before the app shipped and checked against published tables to within a few minutes, so nothing is worked out on your phone.