 This claim of dependent possession is derivative upon a further claim: individuation dependence. The general idea of individuation dependence is that the identity of an entity, as an entity of a particular kind s, depends upon things (objects, properties, facts, etc.) distinct from it. A planet is individuation dependent on a star around which it orbits in the sense that without this star, and resulting orbit, it would not be a planet but some other kind of celestial object. The identity of a particular celestial body as a planet is dependent on the star and orbit, items distinct from the planet itself. The planet is, in this sense, individuation dependent on the star (Macdonald 1990). A particular skin disturbance correctly classified as sunburn is individuation dependent on solar radiation in the sense that it can be sunburn only if it produced by solar radiation (Davidson 1987). Thus, the identity of a skin disturbance as an instance of sunburn depends on its standing in an appropriate relation to ultraviolet radiation, and it cannot be an instance of sunburn unless it stands in this relation. Sunburn is, in this sense, individuation dependent on solar radiation