On Aug. 28, 2026 — the evening of Aug. 27 in some time zones — the Moon passed into Earth's shadow, producing a deep partial lunar eclipse. At the moment of greatest eclipse, 12:13 a.m. EDT, 96.3% of the Moon's disk lay inside Earth's umbra, the central and darkest part of the shadow where sunlight is fully blocked, leaving only a thin sliver of the lunar surface in the penumbra.
Partial eclipses occur when the Moon, Earth, and Sun align imperfectly, so only part of the lunar surface enters the umbra. A coverage of 96.3% is nearly total, making the event visually striking for observers with clear skies in the right longitude and offering a preview of what a total eclipse would look like at the same geometry.
For skywatchers, the practical lesson is to note eclipse timing across time zones. The Aug. 28 event peaked late at night Eastern time; planning around local visibility and the umbra's depth helps catch similar celestial events when the Moon skirts Earth's shadow so closely and when only a fraction of the disk remains illuminated.