A partial lunar eclipse will be visible across Spain on August 28, 2026, with regional differences in visibility and a potential reddish hue due to Earth’s atmosphere, according to multiple sources citing the Instituto Geográfico Nacional (IGN).
The event, the second astronomical spectacle of August following a solar eclipse on the 12th, will see the Moon pass through Earth’s shadow, with the maximum phase occurring at 6:12 AM. While the eclipse will be visible nationwide, observers in central and eastern Spain, the Balearic Islands, and Melilla will witness the Moon set before the partial phase concludes, according to Nationalgeographic and Okdiario. In contrast, western Spain, the Canary Islands, and Ceuta will have extended viewing opportunities as the Moon remains above the horizon longer.
Regional Visibility Differences
The eclipse’s visibility varies significantly by location. In central and eastern Spain, the Moon will set before the partial phase ends, cutting short the view for observers in those regions. This aligns with data from the Instituto Geográfico Nacional (IGN), which notes that the Moon will enter Earth’s penumbra at 3:23 AM, with the partial phase beginning at 4:33 AM and peaking at 6:12 AM. The event will conclude at 9:01 AM when the Moon fully exits the penumbra. Okdiario highlights that Cantabria and other western regions will have better conditions, as the Moon will remain visible past the partial phase’s end.
Ondacero emphasizes that the eclipse coincides with a full Moon, meaning the Moon starts the event fully illuminated before entering Earth’s shadow. This contrast between the Moon’s bright surface and the encroaching shadow will be most pronounced in regions where the eclipse is visible in its entirety. However, in areas where the Moon sets early, observers will miss the latter stages of the partial eclipse.
The Science Behind the Red Hue
While the Moon will not turn fully red during this partial eclipse, some regions may observe a reddish or coppery tint in the shadowed portion. Nationalgeographic explains that this occurs because Earth’s atmosphere scatters shorter blue wavelengths of sunlight, allowing longer red wavelengths to reach the Moon. However, since the eclipse is partial, not total, the Moon will not be entirely within Earth’s umbra, preventing a “blood moon” effect. Okdiario notes that the exact shade of the illuminated shadow depends on atmospheric conditions, with factors like pollution or cloud cover potentially altering the appearance.
The phenomenon is consistent with how Earth’s atmosphere affects lunar eclipses. As sunlight passes through the atmosphere, it bends and refracts, casting a reddish glow on the Moon. This same effect causes the vivid orange and red hues of sunrises and sunsets. However, because the August 28 eclipse is partial, the Moon will only partially enter the umbra, resulting in a less dramatic color change than a total eclipse.
Timing and Practical Tips for Observers
The eclipse’s timing poses challenges for observers, particularly in central and eastern Spain, where the Moon will set before the event concludes. Okdiario advises viewers in these regions to prioritize early observation, as the partial phase will be visible only until the Moon dips below the horizon. In western Spain, the Canary Islands, and Ceuta, the eclipse will be more easily observed, with the Moon remaining above the horizon through the partial phase.
Experts from IGN and other sources recommend finding a clear, unobstructed view to the west, as the Moon will be low on the horizon during the eclipse. Ondacero notes that even in regions with extended visibility, factors like urban light pollution or weather conditions could affect the view. The eclipse will not require special equipment, as it is safe to watch with the naked eye, unlike solar eclipses.
For those in areas where the eclipse is fully visible, the event offers a chance to witness the interplay between Earth’s shadow and the Moon’s surface. The partial nature of the eclipse means that the Moon will not disappear entirely, but its gradual dimming and color shift will be a notable spectacle. Observers are encouraged to check local weather forecasts and choose a vantage point with minimal obstructions.
