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• a  of or belonging to or active during the day
  diurnal animals are active during the day
  diurnal flowers are open during the day and closed at night
  diurnal and nocturnal offices
• s  having a daily cycle or occurring every day
  diurnal rotation of the heavens

• From Constantinople at the Golden Horn, along the length of the Bosporus, flanked by its minarets and white domes, diurnal scene of a thousand scurrying ships, all was silent as a graveyard.
• But this theory of diurnal, tide-like pulsation has not explained all radio reactions against the Kennelly-Heaviside Layer.
• The little eight-page newspapers of Paris, brilliant, powerful and many, continue their diurnal animadversions against the United States.

• nocturnal

News & Articles

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• Mars water-ice clouds are key to temperature pattern
  KRISTEN BUTLER, UPI.com Water-ice clouds on Mars are the key to the planet's semi-diurnal tides and unusual thermal cycle.
  June 13, 2013 - UPI

Quotes

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• Verlyn Klinkenborg in Business Mirror
  The writer Verlyn Klinkenborg writes: "If humans were truly at home under the light of the moon and stars, we would go in darkness happily..........Instead, we are diurnal creatures, with eyes adapted to living in the sun's light."
• Daniel in San Francisco Chronicle
  Green Valley is the most consistent viticulture appellation in Northern California,says Daniel Roberts, a viticultural consultant. "There's less diurnal variance, or difference between day and nighttime temperatures, and less difference...