Day length, or length of day, or length of daytime, is the time each day from the moment the upper limb of the sun's disk appears above the horizon during sunrise to the moment when the upper limb disappears below the horizon during sunset. Due to the diffusion and refraction of sunlight by the atmosphere, there is actually daylight even when the sun is slightly below the horizon. The period when it is still somewhat light even though the sun is below the horizon is called twilight.
Read more about Day Length: Description, Alternate Definition, Historical Variation of Day Length Because of Tidal Acceleration
Famous quotes containing the words day and/or length:
“Each singing what belongs to him or her and to none else,
The day what belongs to the day—at night the party of
young fellows, robust, friendly,
Singing with open mouths their strong melodious songs.”
—Walt Whitman (1819–1892)
“It was inspiriting to hear the regular dip of the paddles, as if they were our fins or flippers, and to realize that we were at length fairly embarked. We who had felt strangely as stage-passengers and tavern-lodgers were suddenly naturalized there and presented with the freedom of the lakes and woods.”
—Henry David Thoreau (1817–1862)