Keskil, Z.A.Keskil, S.2020-06-252020-06-252002closedAccess0306-9877https://doi.org/10.1054/mehy.2001.1530https://hdl.handle.net/20.500.12587/3018Contrary to what has long been suggested, the biological clock is not a poor timekeeper. In fact, it has been working in precision for millions of years as a genetically set clock, independent of environmental periodicity. However, as the Earth's rotation has gradually slowed, this internal clock has gone through a relative phase shift. Extrapolating of changes backwards through time shows that the clock was set when mammals first appeared on the planet. Interestingly, primates are the only beings that have a free-running cycle longer than 24 hours. This bioclock may be set by lunar entrainment, or may be set extraterrestrially? (C) 2002 Elsevier Science Ltd. All rights reserved.eninfo:eu-repo/semantics/closedAccessArticle58425726010.1054/mehy.2001.15302-s2.0-003599665812027515Q1WOS:000177023300003Q4