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Women wearing plastic face shields use special protective glasses as a filter to take pictures with an iPhone camera of an annular partial solar eclipse in Cairo, Egypt, 21 June 2020. A partial solar eclipse occurs when a portion of the Earth is engulfed by the shadow (penumbra) cast by the Moon as it passes between our planet and the Sun in imperfect alignment. During this annular eclipse – the first of the decade – the Moon appears to cover the Sun, leaving the Sun's halo as a visible rim forming an annulus, popularly known as the “ring of fire”. (Photo by Mohamed Hossam/EPA/EFE)
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