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Photoperiodism is the physiological reaction of organisms to the length of light or a dark period. It occurs in plants and animals. Plant photoperiodism can also be defined as the developmental responses of plants to the relative lengths of light and dark periods. They are classified under three groups according to the photoperiods: short-day ...
Earth Hour is a worldwide movement organized by the World Wildlife Fund (WWF). The event is held annually, encouraging the individuals, communities, and businesses to give an hour for Earth, and additionally marked by landmarks and businesses switching off non-essential electric lights, for one hour from 8:30 to 9:30 p.m., usually on the last Saturday of March, as a symbol of commitment to the ...
Daytime. Daytime as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight. Daytime occurs when the Sun appears above the local horizon, that is, anywhere on the globe's hemisphere facing the Sun. In direct sunlight the movement of the sun can be recorded and observed using ...
This month, producers launched a 40-day crowdfunding campaign with the goal of raising $2 million to help complete the film with a planned 2015 release — to coincide with the 100th anniversary ...
Daylight. Daylight is the combination of all direct and indirect sunlight during the daytime. This includes direct sunlight, diffuse sky radiation, and (often) both of these reflected by Earth and terrestrial objects, like landforms and buildings. Sunlight scattered or reflected by astronomical objects is generally not considered daylight.
Golden hour (photography) Four photos taken during golden hour. In photography, the golden hour is the period of daytime shortly after sunrise or before sunset, during which daylight is redder and softer than when the sun is higher in the sky . The golden hour is also sometimes called the magic hour, especially by cinematographers and ...
Poet Dylan Thomas c. 1937–1938. " Do not go gentle into that good night " is a poem in the form of a villanelle by Welsh poet Dylan Thomas (1914–1953), and is one of his best-known works. [ 1] Though first published in the journal Botteghe Oscure in 1951, [ 2] the poem was written in 1947 while Thomas visited Florence with his family.
Taken on 20 October 1968 from Apollo 7. Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is scattered and filtered through Earth's atmosphere as daylight when the Sun is above the horizon.