Deep partial lunar eclipse will turn the Moon copper red on 28 August 2026

Global timing and sky observation

Skywatchers across multiple continents will observe a partial lunar eclipse on the night of 27 to 28 August 2026. The full event will span 5 hours and 38 minutes, visible across Europe, the Americas, Africa, and western Asia. During the peak of the alignment, Earth's umbral shadow will cover up to 96% of the lunar surface. Because this alignment coincides with the August full moon, often referred to in traditional folklore as the Sturgeon Moon, observers will see the lunar disk darken and shift in color over several hours.

Morning viewing conditions in Poland

In Poland, the eclipse will unfold during the early morning hours of Friday, 28 August. The partial phase will begin at approximately 04:30 Polish time, with Earth's shadow covering nearly half of the lunar surface by 05:00. The maximum phase of the eclipse will occur at approximately 06:12, though observers in Poland will not witness this peak because the Moon will have already slipped below the western horizon. Viewing conditions will be comparatively better in western Poland, where the Moon sets later.

The Moon will set at approximately 05:45 in Warsaw and just after 06:00 in Poznan. The Polish Space Agency (POLSA) advises observers to select elevated locations with an unobstructed view toward the western horizon, away from trees and tall structures. Unlike solar eclipses, observing a lunar eclipse requires no protective eye filters and is completely safe to view with the naked eye, though binoculars or a small telescope will assist in tracking the boundary of Earth's shadow across the lunar terrain.

Rayleigh scattering and optical effects

During the alignment, the Moon will take on a reddish, copper, or deep orange hue rather than vanishing entirely from the night sky. This visual effect stems from Rayleigh scattering, the same atmospheric process that makes the daytime sky appear blue. Shorter wavelengths of sunlight, including blue and violet light, disperse widely in Earth's atmosphere, while longer reddish and orange wavelengths refract through the atmospheric layer and bend into the umbral cone. POLSA detailed this mechanism in an official bulletin:

Earth blocks direct sunlight, so the Moon should theoretically completely disappear, but our planet's atmosphere bends this simple scenario. Part of the sunbeams passes through Earth's atmosphere, is scattered and refracted, and then reaches the shadow area and gently illuminates the surface of the Moon. NASA describes Earth's atmosphere as a kind of annular lens that refracts light toward Earth's shadow.

Beyond ground-based observations, the passage of Earth's shadow presents operational adjustments for lunar orbiters. Probes orbiting the Moon depend on solar panels for electricity, and the loss of direct sunlight temporarily limits power generation for onboard instrumentation.

Upcoming astronomical events

The eclipse concludes a month of notable celestial activity, following the 12 August solar eclipse and the annual Perseid meteor shower. Astronomers have already mapped the subsequent lunar events visible in the coming years.

The next lunar eclipse will be a penumbral event on 20 February 2027. Following that, observers will see another partial lunar eclipse on 12 January 2028, leading up to a total lunar eclipse on 31 December 2028.