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单词 occultation
释义
occultation

Physics
  • The disappearance of a star, planet, or other celestial body behind the moon or another planet, while it is being observed. A solar eclipse is a form of occultation.


Astronomy
  • The passage of one astronomical body in front of another, usually the obscuration of a star by the Moon; strictly speaking, a solar eclipse, when the Moon passes in front of the Sun, is a special form of occultation. Precise timings of lunar occultations of stars help to refine our knowledge of the Moon’s orbit. Occultations of stars by asteroids and planetary satellites can provide improved diameters for the occulting bodies. The Galilean satellites of Jupiter are regularly occulted by the planet. Jupiter’s satellites may occult one another when Earth lies close to their orbital plane. See also Grazing Occultation.


Space Exploration
  • A temporary obscuring of a star or spacecraft as it passes behind a celestial object, or its atmosphere or rings. Occultations are used to provide information about changes in an orbit, and the structure of objects in space, such as radio sources. When a spacecraft is obscured, it can rotate so that its radio signal is refracted towards the Earth. The point of refraction is known as ‘virtual Earth’.


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