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Artist's view showing the eclipse of the Sun by the Earth as seen from the Moon
This total lunar eclipse, the first since 2022, will be an astronomical event not to be missed. It will occur when the Moon, Earth, and Sun align perfectly, plunging our natural satellite into the Earth's shadow. This phenomenon, often nicknamed "blood moon," offers a unique opportunity to observe the subtleties of our solar system.
Why does the Moon turn red?
During a total lunar eclipse, the Moon passes into the Earth's shadow. The sunlight that normally illuminates it is then blocked. However, some of this light passes through the Earth's atmosphere, which acts as a filter.
The Earth's atmosphere scatters the blue colors of sunlight, which gives the sky its blue color during the day. On the other hand, the red and orange colors, which have longer wavelengths, pass through and reach the Moon.
This is why the Moon takes on a reddish hue, similar to that of a sunset. This phenomenon, often called "blood moon," is thus due to the simultaneous projection of all the red glows from the Earth's sunrises and sunsets onto the lunar surface.
How to observe the eclipse?
No special equipment is needed to enjoy this spectacle. However, binoculars or a telescope can reveal additional details on the lunar surface. A location away from urban lights and a clear sky are ideal for optimal observation.
The eclipse will be visible from the Americas, Western Europe, and parts of Africa. The website Time and date will provide more details on where it can be admired (subject to good weather conditions, of course). The partial phases, before and after totality, will last about 75 minutes, offering a long observation window. Unlike solar eclipses, lunar eclipses are safe for the eyes and can be admired with the naked eye.
For those who miss this event, another total lunar eclipse is scheduled for September 2025, followed by another in March 2026.