day length

(redirected from Length of daytime)

day length

the number of daylight hours per day, increasing towards midsummer and the reverse towards midwinter. The effective trigger in the commencement and cessation of the breeding seasons in those species that demonstrate seasonal breeding.
References in periodicals archive ?
The study indicates that the improvement in performance accuracy on "Guitar Hero III" was greater after a night of sleep than after a similar length of daytime wakefulness.