Initializing Interface...
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PHASE // ALBEDO
Analysis detects fragmented albedo. The Moon's reflectivity is approximately 0.11 — nearly identical to worn asphalt. High luminosity is purely a function of solar opposition.
TEMPORAL // SYNODIC
The synodic cycle averages 29.53 days. Every lunation tracks the return to a precise Sun-Earth-Moon alignment, distinct from the sidereal period of 27.32 days.
SPATIAL // ZENITH
Rotation is relative to your local zenith. The apparent "tilt" accounts for parallactic rotation — a visual shift caused by the observer's motion around Earth's rotational axis.
MOTION // LIBRATION
Detected optical libration. Despite tidal locking, the Moon "wobbles" — allowing observers to view 59% of the total lunar surface over time, not merely 50%.
PHYSICS // TIDAL_LOCK
Synchronous rotation is forced by Earth's tidal torque. The Moon's centre of mass is offset ~2 km toward Earth, perpetually anchoring the near side to face us.
ORBITAL // VELOCITY
COORDINATES // RA_DEC
ORBITAL // EVENTS
simulation::orbital_sync
ETYMOLOGY // PERIGEE
From Greek περίγειον — peri ("near") + gē ("Earth"). The point in the lunar orbit of closest approach — approximately 356,500 km. At perigee, the Moon appears 14% larger and drives stronger tidal forces.
ETYMOLOGY // APOGEE
From Greek ἀπόγειον — apo ("away from") + gē ("Earth"). The point of maximum separation — approximately 406,700 km. The Moon moves ~30% slower here per Kepler's second law — equal areas in equal times.
REFRACTION // ERR_CAL
Light bends through the atmosphere causing the Moon to appear flattened and larger near the horizon.
+0% vs mean diameter
MOON ILLUSION
The Moon appears larger near the horizon but its angular diameter is identical at zenith. A purely psychological phenomenon caused by ground-reference comparison.
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OPPOSITION // LUM
The Moon reaches opposition when it is on the opposite side of Earth from the Sun, appearing 100% lit.
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CONJUNCTION // DARK
Occurs at conjunction — Moon and Sun share the same ecliptic longitude, making the near-side invisible.