11. The timing of migration seems to be controlled primarily by changes in day length . 12. Short day length promotes asparagine formation, whereas glutamine is produced under long day regimes. 13. Artificial light can be used to extend day length . 14. The irregular day lengths mean that fractional Julian days do not work properly with UTC. 15. However, photoperiod only predicts overwintering in areas where day length effects the maturation of milkweeds. 16. Different snails respond to day length in different ways. 17. Day length variations with latitude can also impact breeding.18. Because day length changes through the seasons, every animal has to reset its clocks every day. 19. :: Tango, I'm not sure I follow you on day length in a tidally locked system. 20. This main event also lasts 4 days as opposed to the Fall event's 3 day length .
