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  2. Day and Night (M. C. Escher) - Wikipedia

    en.wikipedia.org/wiki/Day_and_Night_(M._C._Escher)

    Along the center, the image is divided into complementary black (right) and white (left), or, as the title suggests, day and night. The birds of the image contradict the overall partition of black and white throughout the image, as the black birds are in the white part of the image, while the white birds are in the black part, each of them ...

  3. Mars sol - Wikipedia

    en.wikipedia.org/wiki/Mars_sol

    The average duration of the day-night cycle on Mars — i.e., a Martian day — is 24 hours, 39 minutes and 35.244 seconds, [3] equivalent to 1.02749125 Earth days. [4] The sidereal rotational period of Mars—its rotation compared to the fixed stars—is 24 hours, 37 minutes and 22.66 seconds. [4]

  4. Light effects on circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Light_effects_on_circadian...

    [6] [4] A shift in the circadian phase response curve creates a connection between the amount of light in a day (day length) and depressive symptoms in this disorder. [6] [4] Light seems to have therapeutic antidepressant effects when an organism is exposed to it at appropriate times during the circadian rhythm, regulating the sleep-wake cycle ...

  5. Circadian rhythm - Wikipedia

    en.wikipedia.org/wiki/Circadian_rhythm

    A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).

  6. List of nocturnal animals - Wikipedia

    en.wikipedia.org/wiki/List_of_nocturnal_animals

    Crepuscular, a classification of animals that are active primarily during twilight, making them similar to nocturnal animals. Diurnality, plant or animal behavior characterized by activity during the day and sleeping at night. Cathemeral, a classification of organisms with sporadic and random intervals of activity during the day or night.

  7. Photoperiodism - Wikipedia

    en.wikipedia.org/wiki/Photoperiodism

    Photoperiod is the change of day length around the seasons. The rotation of the earth around its axis produces 24 hour changes in light (day) and dark (night) cycles on earth. The length of the light and dark in each phase varies across the seasons due to the tilt of the earth around its axis.

  8. Look up! Mars expected to light up night sky

    www.aol.com/article/2014/04/08/look-up-mars...

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  9. Category:Birds in art - Wikipedia

    en.wikipedia.org/wiki/Category:Birds_in_art

    Banksy's London animal series; The Barbarians (painting) The Beakful; List of wildlife works of art by Frank Weston Benson; Bird (mathematical artwork) Bird in Hand (painting) Bird in Space; Bird on Money; Bird stone; Bird-and-flower painting; Birds in Meitei culture; The Birds of America; The Birds (painting) Black Stork in a Landscape; The ...