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  2. Bliss (photograph) - Wikipedia

    en.wikipedia.org/wiki/Bliss_(photograph)

    Bliss, originally titled Bucolic Green Hills, is the default wallpaper of Microsoft's Windows XP operating system. It is a photograph of a green rolling hills and daytime sky with cirrus clouds . Charles O'Rear , a former National Geographic photographer, took the photo in January 1998 near the Napa – Sonoma county line, California, after a ...

  3. Night sky - Wikipedia

    en.wikipedia.org/wiki/Night_sky

    Paranal Observatory nights. [3] The concept of noctcaelador tackles the aesthetic perception of the night sky. [4]Depending on local sky cloud cover, pollution, humidity, and light pollution levels, the stars visible to the unaided naked eye appear as hundreds, thousands or tens of thousands of white pinpoints of light in an otherwise near black sky together with some faint nebulae or clouds ...

  4. Skyscape art - Wikipedia

    en.wikipedia.org/wiki/Skyscape_art

    Sky can be depicted as many different colors, such as a pale blue or the lack of any color at all, such as the night sky, which has the appearance of blackness, albeit with a scattering of stars on a clear night. During the day, the sky is seen as a deep blue due to the sunlight reflected on the air. Astronomically speaking, the sky is a ...

  5. Great Rift (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Great_Rift_(astronomy)

    Layout of some Great Rift "constellations" as represented by the Inca. Dark zones obscuring the night-sky lighting mass of the bulk of the Milky Way in a dry atmosphere (or at long exposures) were recognized by many ancient civilizations in which a seasonally or regularly dry climate is a frequent feature.

  6. Sky - Wikipedia

    en.wikipedia.org/wiki/Sky

    The night sky and studies of it have a historical place in both ancient and modern cultures. In the past, for instance, farmers have used the state of the night sky as a calendar to determine when to plant crops. The ancient belief in astrology is generally based on the belief that relationships between heavenly bodies influence or convey ...

  7. International Dark Sky Week - Wikipedia

    en.wikipedia.org/wiki/International_Dark_Sky_Week

    In 2009, the United States Dark Sky Week becomes International Dark Sky Week [13] [14] 8 2010 13–14 April [15] [16] 9 2011 3 April The world's first International Dark Sky City was founded in Flagstaff, AZ [17] [18] 10 2012 21 April 11 2013 10 April 12 2014 April 20–26 29 April [19] 13 2015 April 13–18 18 April

  8. Noctilucent cloud - Wikipedia

    en.wikipedia.org/wiki/Noctilucent_cloud

    Noctilucent clouds (NLCs), or night shining clouds, [1] are tenuous cloud-like phenomena in the upper atmosphere of Earth. When viewed from space, they are called polar mesospheric clouds (PMCs) , detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause .

  9. HNSKY - Wikipedia

    en.wikipedia.org/wiki/HNSKY

    HNSKY or Hallo Northern Sky is a free and open-source planetarium program for Linux, macOS, Microsoft Windows, and Raspberry Pi to simulate the night sky. It is provided with several non-English language modules, numerous astronomical catalogues, conversion utilities and tools, as well as several stellar databases.