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figurations when their heads are above water. Although it is theoretically possible for them to see stars from beneath the surface, this would only occur in perfectly calm water. The normal ocean waves would disrupt the sitar images and, because of the critical angle of refraction, would impose a new and shifting horizon. Other types of celestial navigation involving the position of the sun or moon cannot be ruled out; but any theories must be consistent with knowledge of the green turtle'sdoi:10.1126/science.155.3764.828 pmid:6018194 fatcat:obp74mencreezpanjjlmg6rnne