From HomoExcelsior

1. The act of occulting or the state of being occulted. 2. The passage of a celestial body across a line between an observer and another celestial object, as when the moon moves between the earth and the sun in a solar eclipse. 3. The progressive blocking of light, radio waves, or other radiation from a celestial source during such a passage. 4. a lunar occultation of a quasar.

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