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:
“I do not portray the thing in itself. I portray the passage; not a passing from one age to another, or, as the people put it, from seven years to seven years, but from day to day, from minute to minute.”
—Michel de Montaigne (1533–1592)
“Rivers must have been the guides which conducted the footsteps of the first travelers. They are the constant lure, when they flow by our doors, to distant enterprise and adventure; and, by a natural impulse, the dwellers on their banks will at length accompany their currents to the lowlands of the globe, or explore at their invitation the interior of continents.”
—Henry David Thoreau (1817–1862)