# Wadokei57 Astronomical clock — Astronomy for Apple Watch > Apple Watch app displaying traditional Japanese time and a miniature planetarium. (iPhone/iPad app by Shinichi Sekiguchi.) - Source: https://appshunter.io/ios/app/wadokei57-astronomical-clock/id6748839654 (this page in markdown: same URL + `.md`) - Developer: [Shinichi Sekiguchi](https://appshunter.io/developer/1509262945) - Category: Utilities, Education - Price: $3.99 - Age rating: 4+ - Requires: iOS 15.6 · 4 MB - Languages: American English, French (France), German (Germany), Japanese, Korean, Chinese (Simplified, China), Turkish - Released: 2026-03-10 - Data updated: 2026-08-24 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/wadokei57-astronomical-clock/id6748839654/reviews.md ## What is Wadokei57 Astronomical clock? This Apple Watch app combines a Japanese "Wa-dokei" (traditional Japanese clock) based on sunrise and sunset with the world's smallest planetarium. The red hand at the top of the clock shows the current time. The center hand indicates the phases of the moon and the seasons. ● Key Features ・Complications for the Moon, Sun, Venus, and traditional Japanese time ・Traditional Japanese time: A system dividing the day (sunrise to sunset) and night (sunset to sunrise) into six segments each ・Displays time periods based on the 12 Chinese Zodiac signs, synchronized with local sunrise and sunset times based on latitude and longitude ・Simulates the starry sky for locations around the world ・Time navigation by rotating the crown ・Displays a gradient on the day/night ring representing night sky brightness based on moon phase and altitude ●About WADOKEI The ancient Japanese WADOKEI has 12 animals named for each hour of the day. ・子: Mid-night – when the Rat is most active. ・丑: Early hours of night – when the Ox is chewing the cud. ・寅: Late hours of night – when the Tiger is prowling and seeking food. ・卯: Sunrise – when the Hare and the Rabbit are busy foraging for food. ・辰: Early morning – when the divine Dragon rises to control the rain (the dawn sunrise determining the day’s weather). ・巳: Mid-morning – when the Snake becomes active. ・午: Mid-day – when the Horse cavalry return from drill. ・未: Early-afternoon – when the Sheep is eating grass. ・申: Mid-afternoon – when the Monkey becomes active hunting scraps. ・酉: Late-afternoon – when the C**k returns from the forest to roost. ・戌: Early-evening – when the Dog keeps watch. ・亥: Late-evening – when everything is quiet and the Pig or Boar forages. (source:wadokei.org) In this app, the hour of 酉 is set to the time of sunset. ● Celestial Simulation ・Real-time Celestial Calculation: Accurate sunrise and sunset times for your current location. ・Constellation Display: Accurately depicts over 1,000 stars and 88 constellations. ・Sun and Moon Orbits: Track the movement of celestial bodies in real time. ・Tracks the movement of Venus, Mars, Jupiter, and Saturn in real time. ●Privacy & Security ・Location Information: Used Only for Astronomical Calculations; No External Transmission ・Offline Operation: No Internet Connection Required ・Data Protection: All Calculations Performed Locally ・Battery Optimization: Long-Lasting Operation with Efficient Algorithms ● 24 Solar Terms Calendar ・Calculates and displays the 24 solar terms based on the solar orbital position ・Moon Phase Display: Precisely reproduces the phases of the moon, from new moon to full moon. Inverted left and right in the Southern Hemisphere. ・Seasonal Hand: Turn the crown to simulate seasonal changes throughout the year. ● Apple Watch Optimization Swipe to switch between Japanese clock display, starry sky display, and settings screen. Switch between Japanese clock display and starry sky display with index finger and thumb gestures. (Series 9 and later) Double-tap the Japanese clock display screen to switch the kanji characters to animal illustrations. Location support: Accurate astronomical calculations anywhere in the world. ● Expanded Starry Sky View Observe the constellations. Turn the crown to move through time. ・The starry sky rotates in real time with the electronic compass. ・Displays the direction and altitude of the stars. ・Displays the positions of the sun and moon. ● Intuitive Operation ・Long Press: A 10-second animation of seasonal changes throughout the year. ・Swipe: Switch between Japanese clock and starry sky view. ＜ Download now > Timeless beauty meets cutting-edge technology Would you like to watch a millennium of time on your wrist? This software uses the following libraries: ●SunCalc Copyright (c) 2025, Vladimir Agafonkin All rights reserved. （BSD-2-Clause license) ## Key features - Traditional Japanese time system - Miniature planetarium with star simulation - Moon phase and seasonal displays - Complications for Moon, Sun, Venus - Time navigation via crown rotation - Offline operation ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/wadokei57-astronomical-clock/id6748839654/reviews.md ### 4/5 — ふと惑星を調べるのに便利 *2026-07-07* 空を見た時に明るい星があると何かなと気になってましたが、Apple Watchで気軽に惑星の場所がわかるので便利です。 コンパスで星空が回転するので見つけやすいです。 ダブルタップで画面が切り替えられることや、クラウンで日付や時刻が変えられる事がわからなかったのでヘルプをつけて欲しいです。 **Developer response:** あお友さま、利用とレビューありがとうございます。気に入っていただけたようで良かったです。 操作のヘルプ機能は今後つけて行きたいと思います。 各画面でシングルタップ、ダブルタップ、ロングタップ、クラウンの回転を試していただければ一通りの機能は利用できると思います。 シーリーズ９以降ですと、人差し指と親指を２回タッチするジェスチャーでの画面切り替えができます。 時計の画面に和時刻や二十四節気、月や金星の満ち欠けを表示するコンプリケーション機能もありますので、お使いの時計画面でロングタップしてコンプリケーションからお選びください。 ## Frequently asked questions about Wadokei57 Astronomical clock ### What is Wadokei57 Astronomical clock? Wadokei57 Astronomical clock is an Apple Watch application that merges a traditional Japanese "Wa-dokei" system with a miniature planetarium. It displays celestial events and time based on local sunrise and sunset. ### How does Wadokei57 Astronomical clock display time? It uses a traditional Japanese time system that divides the day and night into six segments each, synchronized with local sunrise and sunset. It also displays time periods based on the 12 Chinese Zodiac signs. ### Can Wadokei57 Astronomical clock simulate the starry sky? Yes, it accurately depicts over 1,000 stars and 88 constellations, simulating the starry sky for locations worldwide. You can navigate through time by rotating the crown. ### Does Wadokei57 Astronomical clock require an internet connection? No, Wadokei57 Astronomical clock is designed for offline operation. All astronomical calculations are performed locally on your device, ensuring privacy and data protection. ### What devices does Wadokei57 Astronomical clock support? Wadokei57 Astronomical clock is optimized for Apple Watch and also supports iPhone and iPod devices. It was released on March 10, 2026, and last updated on July 7, 2026. ### What is the price of Wadokei57 Astronomical clock? Wadokei57 Astronomical clock is a paid application priced at $3.99. It does not feature in-app purchases or advertisements. ### What age rating does Wadokei57 Astronomical clock have? Wadokei57 Astronomical clock has an age rating of 4+. This indicates it is suitable for children and general audiences. ### Does Wadokei57 Astronomical clock have ads? No, Wadokei57 Astronomical clock is ad-free. The application is a paid utility and does not display any advertisements to users. ## Version history (last 5 releases) ### 1.18.4 — 2026-07-07 1.18.4 Modifying language files Changing icons ### 1.18.3 — 2026-07-01 1.18.3 Added the ability to switch to Night Mode by double-tapping the star map. Highlighted the Great Square of Pegasus. ### 1.18.2 — 2026-06-30 1.18.2 Fixed an issue with location settings. ### 1.18.1 — 2026-06-26 1.18.1 ・Added a complication to display Venus's phases ・Revised time description text ・Long-press the starry sky screen to animate the movements of the Sun, Moon, and planets over a one-year period ### 1.18.0 — 2026-06-16 ver.1.18.0 A complication has been added. Turkish, French, and German language support has been added. ## More apps by Shinichi Sekiguchi - [HinaDoll](https://appshunter.io/ios/app/hinadoll/id1559234915) All apps by Shinichi Sekiguchi: https://appshunter.io/developer/1509262945 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*