No birth chart. No daily horoscope feed. No "cosmic profile" stored on someone else's server. Retrograde turns Mercury timing into a live astronomical instrument: beautiful, complete, and entirely offline.
The superstition is ancient. The astronomy is real. The habit is surprisingly useful.
Babylonian skywatchers tracked Mercury on clay tablets and timed markets and omens to its moods. Rome later named the planet for the messenger god. So when the messenger appeared to stall and walk backwards, letters, deals, and journeys were assumed to wobble with it.
The backwards walk is a trick of vantage. Mercury laps the Sun every 88 days and passes Earth on the inside three or four times a year; for a few weeks it seems to reverse through the zodiac. Ancient observers saw it plainly. The telescope explained it. The superstition survived anyway.
Whether or not you believe the planet meddles, retrograde season is a shared reminder to communicate deliberately: reread before sending, confirm the plans, back up the work. A calendar that nudges you toward care is useful under any cosmology.
Not a screenshot: the same Kepler model and the same bundled NASA/JPL event table the iPhone app ships with, answering for today's sky. Tap the orrery to replay the sky and watch Mercury double back.
Live from the bundled NASA/JPL event table.
The Today screen is a live orrery with real planetary positions, computed on your phone. Tap to replay the sky and watch the sight line sweep backwards through the zodiac; drag to scrub time, with a soft haptic at every station.
One or two witty, phase-matched notifications a day, delivered at times so uncannily right it feels like the app knew. Practical alerts too: a nudge before retrograde begins, and the all clear when it ends.
A year ribbon, a heat-ramp calendar, and an answer for any date from 1900 to 2100, so you can schedule the launch, the flight, or the signing with your eyes open. Export any window to your calendar with write-only access.
The current phase on your Home Screen, Lock Screen families for checking from anywhere, and a daily-advice widget that carries the line of the day. The app stays quiet otherwise.
Retrograde ships with two centuries of Mercury events inside the app itself: every station and shadow window from 1900 to 2100, computed from NASA/JPL Horizons ephemeris. Even the moving sky is calculated on your phone, so every feature works in airplane mode. There's no account and no app server. The only things Retrograde sends are anonymous usage stats and privacy-preserving install measurement, and it never asks to track you.
It asks for two permissions at most: notifications, if you turn on alerts, and write-only calendar access, if you tap "Add to Calendar."
The obsessive little details that picky users notice.
Scrub the orrery and a soft haptic tick marks every station crossing, the exact moment the planet appears to change direction.
Every animation, in the app and on this very page, steps aside the moment you ask the system for calm. Delight shouldn't cost comfort.
No spinners, no fetching, no reconnecting. The whole sky is already on your phone, so every screen is instant, everywhere, forever.
Download free for today's answer, the live orrery, current measurements, any-date reports, sharing, and widgets. Full Instrument is one purchase that opens everything else, for life. No subscription, ever.
Full Instrument is $4.99 in the US, paid once and handled by Apple through the App Store.
Completely. Every retrograde and shadow window from 1900 to 2100 is bundled inside the app, and the moving sky is computed on-device, so it works in airplane mode, in a dead zone, or on a phone that never touches the internet.
Retrograde and shadow dates come from a bundled event table generated from NASA/JPL Horizons astronomical data, the same ephemeris system used for spacecraft navigation. The orrery draws the sky from a standard planetary model, computed entirely on your phone.
Anonymous usage stats and privacy-preserving install measurement, and nothing that identifies you. There's no account and no ads, and Retrograde never asks to track you across other apps or reads your advertising identifier. Your notification preferences live on your device. The privacy policy names every service involved.
No. Whether you treat Mercury retrograde as cosmology or as a shared cultural calendar, the dates themselves are real astronomy, and the orrery shows you the geometry behind the whole phenomenon. Plenty of people just like knowing when everyone around them is going to blame the planets.
Retrograde, for iPhone. Yours through the year 2100.
