Now on the App Store · iPhone, iPad, and Mac
Astrocartography
for where & when.
A warm guide to the real sky. It reads your actual chart, computed on your device, and helps you orient: where to be, when to act, and how to mark the turning points.
Arcturus is the star wayfinders steered by. We set it into an old compass rose and gave it a voice.
Astrocartography for where to live, work, and travel; plus cosmic timing for when to act.
Free to download · computed on your device
Loved on the App Store
Built on a real ephemeris, validated 1900–2090; the Sun agrees to under two-thousandths of a degree. See the math →
Launch offer: start free
Pick a plan to redeem in the App Store: 2 months free on yearly, or 1 month free on monthly.
On a computer? Scan to redeem the 2-month offer on your phone.
Want cosmic timing in your inbox? Free weekly notes on the sky.
Computed on your device. No account, no tracking. Your data stays in your hands.
Where · Astrocartography
Start with the map. Your birth chart, mapped onto the whole planet. Score thousands of cities for love, work, vitality, and growth, and compare places side by side. Planning a move, a relocation, a trip, or a fresh start? Find the ground that backs you.
When
Daily cosmic weather, moon phases, and the transits actually touching your chart. Zoom from today out to the year. Catch the windows worth using and the ones worth resting through.
Ritual
Guided practices for each moon phase. Small ways to mark a threshold instead of letting it pass unnoticed.
Together
Add a second chart for couples mode: synastry, composite, and the places that hold you both. Or go wider with group mode for three to six people.
Astrology here is for reflection, not prediction. A way to read the weather, not a forecast you have to obey.
Astrology built on the actual sky, brought all the way down to what you can do with it.
The astronomy is real
Your chart is computed on your device from a real ephemeris and validated against the reference standard from 1900 to 2090. The Sun agrees to under two-thousandths of a degree. You can check the math; we publish it.
See the accuracy numbers →Your chart, spoken
A personal audio reading generated from your real placements, in one of eight interpretive voices your chart selects. It reads the full architecture: your chart's dominant shape, its weight, and the planets with the most pull.
Get it on the App Store →Depth the category skips
Profections, firdaria, zodiacal releasing, chart shape, dispositors. The techniques a working astrologer uses, surfaced without the jargon wall.
It stays yours
Everything computes on your device. No account, no tracking. Your data leaves your hands only when you choose to send it.
Learn the ideas: Why where beats when in astrology · Your chart is a rhythm, not a forecast
The things people ask before they download.
Is Celestium free?
Yes. Celestium is free to download and use on iPhone, iPad, and Mac. Your birth chart, the daily sky, moon phases, and a 90-second audio reading of your chart are all free. Premium unlocks the full astrocartography map, deeper timing, couples and group mode, and longer readings.
How does the audio reading work?
Celestium generates a personal audio reading from your real placements, in one of eight interpretive voices your chart selects. It reads the architecture of your chart: its dominant shape, where the weight sits, and the planets with the most pull. It comes with Celestium, free to download on the App Store.
Is the astrology accurate?
The astronomy is real. Your chart is computed on your device from a genuine ephemeris and validated against the reference standard from 1900 to 2090; the Sun agrees to under two-thousandths of a degree. We publish the math. Astrology here is offered for reflection, not prediction. See the accuracy numbers →
Do you track me or store my data?
No account, no tracking. Everything computes on your device, and your birth data stays in your hands. It leaves your device only when you choose to send it, such as sharing a couples invite.
What if I don't know my exact birth time?
You can still use Celestium. Placements that depend on the exact minute, like your rising sign and house cusps, are most precise with a known birth time, but your planets, the daily sky, and much of the timing work still hold. You can refine the time later.
What is astrocartography?
Astrocartography maps your birth chart onto the whole planet, so you can see where different energies are strongest for you: love, work, vitality, growth. Celestium scores thousands of cities and lets you compare places side by side when you are planning a move, a relocation, or a trip. Why where beats when →