A simultaneous or joint appearance; the event of two or more things appearing at the same time.
From Latin co- (together) plus appearance (from appear plus -ance suffix). Formed as a noun to describe the phenomenon of things appearing together.
In astronomy, coappearance is a crucial concept—when two celestial bodies appear in the same location from Earth's perspective, it's a conjunction or coappearance that ancient astronomers used to mark time and predict futures.
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