First Quarter Moon lights up June 21 sky with visible craters and maria

Each month, the Moon traces a patient arc through light and shadow, and on June 21 it arrives at its First Quarter — half its face aglow, 54 percent illuminated, offering a quiet invitation to look upward. This phase, visible from anywhere on Earth with clear skies, sits at the midpoint between darkness and fullness, a threshold moment in a 29.5-day cycle that has anchored human calendars since long before clocks existed. What the sky offers tonight is not spectacle so much as continuity — the same craters and ancient plains that drew the eyes of every generation before ours.