Sunclock - Astronomical Clock

Sunclock is an Android app designed to seamlessly work across multiple devices in the Google ecosystem, including phones, tablets, TVs, Chromecast, and Chromebooks.

Sunclock is your all-in-one app for tracking sunrise, sunset, twilight, moon phases, and more. Perfect for photographers, astronomers, and anyone who loves to keep track of daily and seasonal rhythms.

The four most important "clock mechanics," along with endless customization options, including dark and light modes, are showcased in the images below:



Double dial with 12 and 24 hours	24-hour dial	Spiral dial	Digital dial

Sunclock – Feature Overview

Sun & Daylight

Sunrise and Sunset: Precise display of these times for any location and date.
Noon and Day Length: Calculation and visualization of solar noon and total daylight duration.
True Midday on Top: Option to align true solar noon at the top of the clock.
Twilight Phases: Civil, nautical, and astronomical twilight shown separately.
Golden and Blue Hour: Visual representation of these light phases – ideal for photography and planning.
Solar Altitude Angle: Display current sun elevation in the sky.
Solar Time: Show true solar time alongside standard time.
Equation of Time Hand: Visualize the difference between solar and clock time.
Night Hunting Ban (Germany): Optional marker for legal hunting times based on local sunset/sunrise.

Moon Features

Moonrise and Moonset: Time display for different locations and dates.
Moon Phases: Current phase of the moon displayed.
Moonlight Forecast: Prediction of moonlight conditions – useful for romantic nights or stargazing.

Dial & Display Options

Dial Layouts:
- Classic 12-hour display
- Pure 24-hour display
- Combined 12-/24-hour display
- Spiral dial (innovative design)
- Digital display
- Zodiac dial
Dual Scale: Simultaneous 12- and 24-hour display.
Color & Font Customization: Full design personalization.
Choose from 10+ fonts: Personalize typeface to match style.
Change hand shape, length & width: Customize clock hands in detail.
Size & Position Adjustment: Resize and reposition the clock within its viewport.
Size Adjustment: Scalable clock elements.
Evenly Moving Second Hand: Smooth, non-stepped motion.
Use Photo Background: Set your own background image behind the clock.
Show Indian Arabic Numerals: Optional numeral style support.

Time Concepts & Calendar Systems

Alternative Timekeeping Methods:
- Byzantine time (day starts at sunset)
- Temporal hours (12 unequal hours between sunrise and sunset)
- Roman time
- Athonite time
- Horae Temporales
- Zmanim (Jewish)
- Alaturka (Arabic)
- Japanese Wadokei system
- Chinese Shíchen (時辰) system
- Rāhu Kalam (Vedic)
Religious Time Systems:
- Roman Catholic Liturgy of the Hours
- Islamic prayer times (eight calculation methods)
- Muslim prayer time markers
- Muslim fasting display
- Candle lighting times for vespers, Shabbat, and holidays
- Arabic hour names
Spanish Electric Time Periods: Visualization of grid-controlled switching times.

Platforms & Usage

App, Widget & Wallpaper: Flexibly integrated into daily life.
Up to Three Widgets: Each widget can be uniquely designed, positioned, and sized (1×1 grid or larger).
Android TV & Chromecast: Display on large screens possible.
Fullscreen Mode: Optional immersive display without interface elements.
Screensaver Mode: Display clock while device is idle or loading.
Sharing Function: Easily share your clock display.
Ads-Free with Donation: Advertising is turned off with a donation starting from 1 CHF.

Interactive Features

Simulate Date & Time: Explore any moment worldwide.
Automatic Animation: Smooth and vivid cosmic transitions.
Gallery of 40 Sample Clocks: Inspiration from ready-made designs.
Show Countdown: Display time remaining until a defined event.
Time Since Sunrise/Sunset: Track how much time has passed since the last solar transition.
Topographic World Map (Flat Earth): Optional map-based view to visualize daylight zones.
Sidereal Time: Show astronomical sidereal time alongside solar time.
Coordinated Universal Time (UTC): Display global time reference.
Load and Save Clock Design: Export and import your personalized clock configurations.
Undo Feature: Revert recent changes with a rollback button.

Usability & Onboarding

Intuitive Interface: Easy to use.
Integrated Help: Quick start for new users.
Customizable & Expandable: Suitable for beginners and experts alike.

Target Groups

Photographers
Astronomers
Travelers
Cultural and timekeeping enthusiasts
Technology and design lovers

		Get it on Google Play.

		Check out our Instagram and share your clock screenshots.

		Visit our YouTube channel to see videos of the watches in action.

		Access In-app Help for assistance.

		Sunclock was the very first app in the Trilogy of Time collection, released in 2015.