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2. Quilting - Wikipedia

   en.wikipedia.org/wiki/Quilting

   The American quilt: A history of cloth and comfort, 1750-1950 (1993). LaPinta, Linda Elisabeth. Kentucky Quilts and Quiltmakers: Three Centuries of Creativity, Community, and Commerce (University Press of Kentucky, 2023) online review of this book. Torsney, Cheryl B., and Judy Elsley, eds. Quilt Culture: Tracing the Pattern. (U of Missouri ...

3. 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.

4. Rayleigh sky model - Wikipedia

   en.wikipedia.org/wiki/Rayleigh_sky_model

   The same elastic scattering processes cause the sky to be blue. The polarization is characterized at each wavelength by its degree of polarization, and orientation (the e-vector angle, or scattering angle). The polarization pattern of the sky is dependent on the celestial position of the Sun. While all scattered light is polarized to some ...

5. Astrometry - Wikipedia

   en.wikipedia.org/wiki/Astrometry

   Astrometry is a branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. It provides the kinematics and physical origin of the Solar System and this galaxy , the Milky Way .

6. Sky - Wikipedia

   en.wikipedia.org/wiki/Sky

   View of the night sky in July The day's blue sky, clouds and the Moon. The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct from outer space.

7. Diffuse sky radiation - Wikipedia

   en.wikipedia.org/wiki/Diffuse_sky_radiation

   The blue sky spectrum contains light at all visible wavelengths with a broad maximum around 450–485 nm, the wavelengths of the color blue. Diffuse sky radiation is solar radiation reaching the Earth 's surface after having been scattered from the direct solar beam by molecules or particulates in the atmosphere .