title: The human circadian clock entrains to sun time.
authors.forename: Till
authors.initials: T
authors.lastname: Roenneberg
authors.forename: C Jairaj
authors.initials: CJ
authors.lastname: Kumar
authors.forename: Martha
authors.initials: M
authors.lastname: Merrow
mesh_terms: D001683:Biological Clocks / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D017440:Photoperiod; D012925:Social Conformity; D013472:Sunlight