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I will stop this elaboration right now, bearing in mind, that this information is widely common in many encyclopedias, astronomy books, and obviously on the web. Because its average distance to Earth is 400x shorter than the distance of the Sun, we are lucky to experience an awesome total solar eclipse phenomenon from time to time. ![]() The Moon is around 4 times smaller than Earth and around 400x smaller than our mother star at once. In Earth conditions, the major culprit of both occultation and a significant daylight weakening is obviously the Moon – a natural satellite of our planet. A popular kind of observation is the occultation of stars by small asteroids or the Moon when these remote objects lose their light for a brief moment. An analogous situation occurs during the transits of internal planets across the solar disk as seen from the Earth. It means, that when some star is blocked by an unknown planet, an instrument such as a Hubble Telescope is inside something like a half-shadow, produced by this unknown planet. ![]() Nowadays a lot of deep space observations concentrated on external planet research are carried out on the basis of a light drop from some particular star. For the sake of simplification, we can say, that this shadow extends into infinity, being expressed as a common light level drop by the illumination source.
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