Linked from

The 15 pages that link to Day length, each with the reason it gives.

• Earth’s rotationRelated: Its long-term increase records the braking effect of lunar tides.

• EquinoxRelated: Daylight approaches twelve hours near an equinox, but atmospheric refraction and sunrise definitions prevent exact equality.

• Axial tiltRelated: Tilt causes seasonal changes in daylight duration, especially at high latitudes.

• SeasonsRelated: Seasonal changes in daylight length alter the time available for solar heating.

• Earth's axial tiltRelated: Tilt makes daylight duration vary with latitude and season.

• Universal TimeRelated: Changes in rotation speed make Universal Time drift nonuniformly.

• Tropic of CancerRelated: Latitude near the tropic shapes seasonal daylight, though less dramatically than at higher latitudes.

• June solsticeRelated: It reaches its annual maximum in the Northern Hemisphere near the solstice.

• March equinoxRelated: Around the equinox, daylight and darkness are nearly equal across Earth.

• Polar motionRelated: Angular-momentum changes that accompany polar motion can also alter the length of day.

• Winter solsticeRelated: The winter solstice brings the shortest daylight interval of the year in its hemisphere.

• WinterRelated: Short winter days limit the time sunlight can warm the surface.

• DaytimeRelated: Its variation is the clearest measurable consequence of latitude and season.