# AstroTime > Earth, Mars, Moon & 8 time scales. Animated orbits. Time Travel to any date. Canonical page: [https://chrome-stats.com/d/com.alvalstudio.astrotime](https://chrome-stats.com/d/com.alvalstudio.astrotime) ## Overview - **ID:** `com.alvalstudio.astrotime` - **Platform:** Android - **Type:** Android app - **Status:** Available - **Publisher:** alvalstudio - **Category:** EDUCATION - **Downloads:** 22 - **Version:** 1.0.2 - **Last updated:** 2026-06-12 - **First published:** 2026-06-11 - **Publisher country:** IT - **Size:** 6.34 MB - **Data as of:** 2026-09-06 - **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.alvalstudio.astrotime) - **Website:** [https://www.alvalstudio.com](https://www.alvalstudio.com/) - **Privacy policy:** [https://alvalstudio.com/app/privacy\_policy\_alval\_studio.html](https://alvalstudio.com/app/privacy_policy_alval_studio.html) ## Description ASTROTIME — Universal, Relativistic & Planetary Clocks

What time is it on Mars right now? How far ahead is a clock on the Moon? What
does your Unix timestamp look like in binary? AstroTime answers all of this —
beautifully, in real time.

━━━ 8 TIME SCALES, ALL AT ONCE ━━━

🌍 UTC — Coordinated Universal Time
The global civil standard. Includes your local timezone alongside UTC, and the
current Solar Longitude (Ls) of Earth in its orbit.

⚛️ TAI — International Atomic Time
The output of ~450 cesium clocks worldwide. Ahead of UTC by exactly 37 leap
seconds — with an animated historical timeline of every leap second since 1972.

🌌 TDB — Barycentric Dynamical Time
The relativistic clock at the solar system's centre of mass. Shows the periodic
±1.657 ms correction caused by Earth's orbital eccentricity — visualised as a
live sinusoidal curve.

🌕 LTC — Lunar Coordinate Time
Time on the Moon's surface. Clocks tick faster on the Moon due to weaker gravity
(+58.7 µs/day, ITU 2024). Displays accumulated relativistic drift since J2000,
current lunar phase, and all 8 phases of the synodic cycle animated in real time.

🔴 MTC — Coordinated Mars Time
Time at Mars's Prime Meridian (Airy-0 crater), calculated via the NASA Allison &
McEwen algorithm. Shows current Sol, Mars Year, Solar Longitude Ls, and an
animated dual-orbit diagram of Earth and Mars around the Sun.

💻 Unix Epoch
Seconds since 1970-01-01. Includes a live 32-bit binary representation of the
timestamp and a visual countdown to the Y2038 overflow problem.

🔭 GAST — Greenwich Apparent Sidereal Time
Earth's rotation angle relative to the distant stars. Visualised as a rotating
celestial sphere with the vernal equinox pointer (♈ Aries) moving in real time.

🌐 Internet Time (.beats)
Swatch's timezone-free decimal clock. One .beat = 1 min 26.4 s. Displayed on a
1000-division animated dial — the same moment everywhere on Earth.

━━━ KEY FEATURES ━━━

⏳ TIME TRAVEL
Enter any date and time — a birthday, a historical event, a future eclipse — and
watch all 8 clocks instantly recalculate. Includes quick offsets (±1 day, ±1 year)
and a live banner showing the moment you're exploring.

🪐 ANIMATED ORBIT DIAGRAMS
Each planetary clock includes a full-screen Canvas animation:
• Earth orbiting the Sun with current orbital position
• Moon orbiting Earth with correct phase shading and 8-phase strip
• Mars and Earth orbits compared side by side
All orbits show the correct counterclockwise rotation direction.

📖 IN-DEPTH EXPLANATIONS
Every clock includes a collapsible "About" panel with the physics, history, and
real-world use of each time scale — from Einstein's relativity to NASA mission
planning to the Y2038 computer crisis.

🌟 SPACE-THEMED DESIGN
Animated starfield background, shooting stars, per-planet accent colours, and a
dark space aesthetic built for OLED screens.

━━━ WHO IS IT FOR? ━━━

• Space enthusiasts and amateur astronomers
• Software developers curious about time systems
• Students studying physics, relativity, or planetary science
• Anyone who ever wondered what time it is on Mars

━━━ PERMISSIONS ━━━

None. AstroTime requires no permissions, no account, no internet connection after
first load. All calculations run entirely on your device.

━━━ TECHNICAL NOTES ━━━

All time calculations use published scientific formulae:
• MTC: Allison & McEwen (2000), NASA
• LTC drift: ITU recommendations (2024)
• TDB: Fairhead & Bretagnon (1990)
• GAST: IAU 1982 GMST formula
• Solar Longitude: standard equation of centre ## Rankings - #2,556,410 — Overall ## Permissions and access ### Permissions - `android.permission.INTERNET` - `com.alvalstudio.astrotime.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION` - `com.android.vending.CHECK_LICENSE` ## Similar extensions and apps - [AstroClock](https://chrome-stats.com/d/com.hajiamzar.astroclock) — 238 users - [Mars Time](https://chrome-stats.com/d/com.all4automation.mars_time) — 203 users - [Simple Live Solar System](https://chrome-stats.com/d/com.livesolar.solarsystem) — 489 users - [Astro Clock Widget](https://chrome-stats.com/d/it.lucarubino.astroclockwidget) — 50,442 users, 4.41 / 5 - [AstroWatch](https://chrome-stats.com/d/com.hopla.astrowatch.free) — 29 users - [AstroClock](https://chrome-stats.com/d/arnodenhond.astroclocklite) — 57,411 users, 4.47 / 5 - [Earth Circa](https://chrome-stats.com/d/com.earthcirca) — 44 users - [EarthClock](https://chrome-stats.com/d/com.tz.earthclock) — 290 users - [Mars Time](https://chrome-stats.com/d/com.tbo.marstime) — 22 users - [Astral Hours - Planetary Hours](https://chrome-stats.com/d/com.velestra.astralhours) — 86 users - [SpaceFan: Moon Phases & Astro](https://chrome-stats.com/d/com.br.spacefanmoonphases) — 4,601 users - [Orb Clock](https://chrome-stats.com/d/com.OrbClock.app) — 3 users --- Source: [Chrome-Stats](https://chrome-stats.com/d/com.alvalstudio.astrotime)