Glance
Wake the round face for time, moon phase, or today’s transit wheel — made for a two- second look, not a session.
Castalia Institute · Founding batch
Astrolabe is a round pocket companion for homes that already use Castalia and Mynah: time at a glance, tonight’s moon, your transits — and when you have a question, you hold one button and listen for the answer.
About the size of a pocket watch · Round 1.75″ display · Wi‑Fi · Built for daily glances, not scrolling
Showing: Moon
Illustration — product photos coming with the founding shipment.
No feed. No app grid. You look, you swipe once in a while, and when you need Castalia you talk to the instrument.
Wake the round face for time, moon phase, or today’s transit wheel — made for a two- second look, not a session.
Hold the side button and ask aloud — about tonight’s sky, your chart, or the day ahead. The watch records, thinks, and answers through Castalia’s voice service (the same family as Mynah).
Tap the other button to hear the last reply again — or your agenda when there’s nothing to replay. Sound comes from the built-in speaker.
Swipe around the bezel. Each face is one job. Astrolabe ships with the full set — time, sky, music status, focus timer, and sign-in for your Castalia account.
Classic analog and digital clocks tuned to the round screen.
Moon illumination disk and a live transit wheel with spoken readings.
Optional Spotify glance, focus countdown for deep work, and QR pairing to your Castalia login.
Mynah is the portrait phone at the center of the home. Astrolabe is the round satellite — pocketable, glanceable, and quiet between questions. Sign in once; your account works on the watch for voice answers.
Same beautiful round hardware. Two ways we flash and tune it for the founding batch.
The complete instrument — every launch face, for families who want time, sky, music, and focus in one swipe cycle.
The chart-first edition — moon and transits up front, tuned prompts for sky language, quieter if you don’t need Spotify or focus timers on your wrist.
We’re building a small first run on the bench — hand-tested units for people who want the instrument early and can tolerate fast-moving firmware.
Astrolabe · complete edition
$349
USD · assembled · USB-C · quick-start card
We reply with availability, deposit, and ship window. No charge from this link alone.
No. Astrolabe talks to Castalia over Wi‑Fi on its own. Mynah is the reference companion in the same household — closer integration is on the roadmap.
It’s closer to a pocket instrument: round display, two buttons, no app store, no notifications feed. You buy it for time, sky, and short voice turns with Castalia.
Founding units ship in waves through 2026. We confirm your window by email after you request a spot.
Reference board: Waveshare ESP32-S3 Touch AMOLED 1.75C class (466×466 round AMOLED). Firmware and build instructions: github.com/CastaliaInstitute/astrolabe.
V0 uses on-device approximations today; server-side ephemeris is in progress. Founders receive updates as accuracy improves — no extra hardware required.