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when the sun or moon goes down, it moves below the horizon so you cannot see it any longer
astronomy a short period when all or part of the sun or moon becomes dark, because of the positions of the sun, moon, and earth in relation to each other. A total eclipse is when the sun or moon is completely covered. An eclipse of the sun is called a solar eclipse, and an eclipse of the moon is called a lunar eclipse.
open/agreeable/able to be communicated with via textadd a word