lysdøgn

Lysdøgn is a Danish term that translates to "light day" or "daylight period." It refers to the duration of time between sunrise and sunset within a 24-hour period. The length of the lysdøgn varies significantly throughout the year due to the Earth's axial tilt and its orbit around the Sun. In the Northern Hemisphere, lysdøgns are longest during the summer solstice around June 20th or 21st and shortest during the winter solstice around December 21st or 22nd. Conversely, the Southern Hemisphere experiences the opposite pattern. This seasonal variation in lysdøgn is a fundamental aspect of Earth's climate and influences numerous biological and environmental processes, including plant growth, animal behavior, and human circadian rhythms. The concept is primarily used in discussions related to daylight hours, astronomical events, and seasonal changes.