Lunar Coordinated Time, selenographic site selector & Moon resident pass
Showing example data: Apollo 11 — Tranquility Base. Click the map or choose a preset to view your site.
Moon Coordinated Time
2026-06-18 08:23:42.897 LTC
Earth UTC
2026-06-18 08:23:42.356 UTC
Accumulated drift since page load
+0.000000 μs ahead of Earth
Preset Sites
Phase: Waxing Crescent
LIVEMoonrise
11:35 PM
Moonset
01:01 PM
Moon is above the horizon
Lighting State
Lunar Night
Until next sunrise
6d 9h
Altitude
-77.7°
Azimuth
Below horizon
Earth illumination
90.6%
Earth's illuminated fraction as seen from this lunar site.
Phase
Full Earth
Surface Temperature Estimate
-173.1°C
Based on Stefan-Boltzmann solar angle model. Range: −173°C to +127°C.
Solar Panel Output
0 W
Solar constant: 1,361 W/m²
Shadow Length (1 m object)
No shadow — nightside
Coordinates
0.67°N, 23.47°E
LTC Timestamp
2026-06-18 08:23:42.897 LTC
Lighting
🌑 Lunar Night
Surface Temp.
-173.1°C
Badge
⚑ Lunar Archaeologist
Issued by MoonSync · fastool.io
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Lunar Archaeologist
LTC is a proposed Moon-based time standard. NASA's 2023 analysis found that Moon clocks gain +56.02 µs per Earth day: weaker lunar gravity causes a gravitational blueshift that outweighs the transverse Doppler redshift from lower orbital velocity. MoonSync accumulates this offset from J2000.0 (Jan 1, 2000 12:00 UTC).
NASA — What Time Is It on the Moon?Moon illumination from Earth is the fraction of the Moon's visible disk lit by the Sun. At New Moon (0%), the Moon is between Earth and Sun, showing only its dark side. At Full Moon (100%), Earth is between Moon and Sun. The percentage follows a smooth sinusoidal curve over the 29.53-day synodic month. MoonSync calculates this in real-time using solar and lunar ephemeris data.
USNO — Moon Illumination DataPSRs are craters near the lunar poles never exposed to direct sunlight, due to the Moon's low axial tilt (1.54°). Temperatures hover around −230 °C, cold enough to trap water ice for billions of years. NASA's LCROSS mission (2009) confirmed water ice deposits in Cabeus crater near the south pole, making PSRs prime candidates for future lunar bases.
NASA Science — Permanently Shadowed CratersMoonSync uses a first-order Keplerian ellipse: r = a(1 − e·cos M), where a = 384,399 km (semi-major axis), e = 0.0549 (eccentricity), and M is the mean anomaly from perigee. Accuracy is ±3,000 km. For navigation-grade ephemerides, NASA/JPL's Horizons system integrates the full DE440 planetary solution.
JPL Horizons — Lunar EphemerisLTC is a proposed Moon-based time standard. NASA's 2023 analysis found that Moon clocks gain +56.02 µs per Earth day: weaker lunar gravity causes a gravitational blueshift that outweighs the transverse Doppler redshift from lower orbital velocity. MoonSync accumulates this offset from J2000.0 (Jan 1, 2000 12:00 UTC).
NASA — What Time Is It on the Moon?Moon illumination from Earth is the fraction of the Moon's visible disk lit by the Sun. At New Moon (0%), the Moon is between Earth and Sun, showing only its dark side. At Full Moon (100%), Earth is between Moon and Sun. The percentage follows a smooth sinusoidal curve over the 29.53-day synodic month. MoonSync calculates this in real-time using solar and lunar ephemeris data.
USNO — Moon Illumination DataPSRs are craters near the lunar poles never exposed to direct sunlight, due to the Moon's low axial tilt (1.54°). Temperatures hover around −230 °C, cold enough to trap water ice for billions of years. NASA's LCROSS mission (2009) confirmed water ice deposits in Cabeus crater near the south pole, making PSRs prime candidates for future lunar bases.
NASA Science — Permanently Shadowed CratersMoonSync uses a first-order Keplerian ellipse: r = a(1 − e·cos M), where a = 384,399 km (semi-major axis), e = 0.0549 (eccentricity), and M is the mean anomaly from perigee. Accuracy is ±3,000 km. For navigation-grade ephemerides, NASA/JPL's Horizons system integrates the full DE440 planetary solution.
JPL Horizons — Lunar EphemerisCalculate solar altitude, azimuth, golden hour, and civil/nautical/astronomical twilight for any location on Earth.
Sidereal Time Calculator for AstronomersConvert between local sidereal time and UTC for telescope alignment and observation planning.
Moon phase checked. Turn your lunar FITS data into stunning images with AstroSky.
AstroSky — free Windows desktop app. Intelligent auto-stretch, 12+ color maps, 8K export, 100% offline.
What phase is the moon tonight? Track the lunar calendar, moonrise & moonset times, and get live illumination data. Plus real-time lunar clock (LTC) and selenographic site selector. Free, browser-only, no sign-up. · LTC offset: NASA 2023 (+56.0205 µs/day) · Orbit: simplified Keplerian DE elements · Temperature: Stefan–Boltzmann model · All 14 calculations execute client-side — zero network requests, zero data transmitted. · Lunar phase timing verified against JPL Horizons DE440 ephemeris for every full moon 2024–2026. Mean phase timing deviation: < 2 minutes. · Ephemeris: JPL DE440 (Valid 1900–2050) · Methodology v2.1.0