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2. File:WISE full sky.jpg - Wikipedia

   en.wikipedia.org/wiki/File:WISE_full_sky.jpg

   To make a map of the sky, astronomers project it into two dimensions. Many different methods can be used to project a spherical surface into a 2-D map. The projection used in this image of the sky, called Aitoff, takes the 3-D sky sphere and slices open one hemisphere, and then flattens the whole thing out into an oval shape.

3. File:The Starry night by Van Gogh, detail of the sky.jpg

   en.wikipedia.org/wiki/File:The_Starry_night_by...

   The following other wikis use this file: Usage on bn.wikipedia.org তারাময় রাত; Usage on cy.wikipedia.org Y Noson Serennog; Usage on es.wikipedia.org

4. File:Europe sunshine hours map.png - Wikipedia

   en.wikipedia.org/wiki/File:Europe_sunshine_hours...

   Download QR code; In other projects Appearance. move to sidebar hide ... image/png. File history. Click on a date/time to view the file as it appeared at that time.

5. Sky brightness - Wikipedia

   en.wikipedia.org/wiki/Sky_brightness

   Sky brightness refers to the visual perception of the sky and how it scatters and diffuses light. The fact that the sky is not completely dark at night is easily visible. If light sources (e.g. the Moon and light pollution ) were removed from the night sky , only direct starlight would be visible.

6. Atmospheric optics - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_optics

   In these three frames, the superior mirage evolves from a 3-image mirage to a 5-image mirage, and back to a 2-image mirage. Such a display is consistent with a Fata Morgana . A mirage is a naturally occurring optical phenomenon in which light rays are bent to produce a displaced image of distant objects or the sky.

7. Digitized Sky Survey - Wikipedia

   en.wikipedia.org/wiki/Digitized_Sky_Survey

   The scanning resulted in images 14,000 x 14,000 (DSS1) or 23,040 x 23,040 pixels (DSS2) in size, [17] or approximately 0.4 (DSS1) and 1.1 gigabytes (DSS2) each. The scanning of First Generation DSS takes a little under seven hours per plate to complete. Due to the large size of the images, they were compressed using an H-transform algorithm.