When the Moon passes between Earth and the Sun, thereby totally or partially obscuring our view of the Sun, we witness a solar eclipse. It happens due to ‘crazy coincidence: the Moon is 400 times smaller than the Sun, but it’s also 400 times closer.’ This means that, from Earth, the Moon appears large enough to block our view of the Sun. The Moon does not cast a shadow over the entire Earth at once, but rather, is seen over a particular spot.