A partial solar eclipse will occur tomorrow, beginning around 10am GMT in the UK and ending by noon. The moon will block 30-40% of the sun's light, creating a visually striking event described as resembling devil horns. Experts caution that it is unsafe to look directly at the sun despite the excitement. Observers in parts of Europe and the eastern US will also experience the eclipse, though it won't be visible in most of the United States and beyond. Weather forecasts predict good visibility for the event in the UK.
During a solar eclipse, what happens is that the moon moves directly between the Earth and the sun. It blocks out a bit of the light.
The eye is so good at adapting to changing light levels that it's surprisingly not that noticeable. The difference between full sunlight and a cloudy day can already be a factor of 100.
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