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Wikipedia definition
1. Limb darkeningLimb darkening refers to the diminishing of intensity in the image of a star as one moves from the center of the image to the edge or "limb" of the image. Limb darkening occurs as the result of two effects: The density of the star diminishes as the distance from the center increases The temperature of the star diminishes as the distance from the center increases. Crucial to understanding limb darkening is the idea of optical depth.
Read “Limb darkening” on English Wikipedia
Read “周辺減光” on Japanese Wikipedia
Read “Limb darkening” on DBpedia

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