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Exploring the Night Sky: A Journey through Celestial Beauty and Applications

The night sky is a marvelous spectacle that captivates our imagination and influences our ambiance. Its importance spans various fields, from art and entertainment to scientific exploration. This guide delves into the ambiance of night scenes, highlighting the roles of the moon, stars, and cosmic phenomena. Applications in films, planetarium shows, simulators, and games harness the allure of the night sky, showcasing its beauty. Understanding celestial objects' illumination, such as the moon's reflection of sunlight and earthshine, enriches our appreciation of these nightly wonders.

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Exploring the Night Sky: A Journey through Celestial Beauty and Applications

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  1. Introduction • Importance of the night sky • Ambiance of night scenes • Applications • Films, planetarium shows, simulators, games

  2. Sun 103 Moon 10-3 Stars 10-8 Zodiacal light 10-7 Airglow 10-8 Cosmic light 10-10 Dim misc. 10 -8 10-9 Sources of Illumination (W/m2)

  3. Model Overview

  4. Moon Position • ~ 59% of the Moon is visible from the Earth • Rotates around itself at the same speed as around the Earth • Elliptical orbit

  5. Modeling the Moon Data from the Clementine project • Geometric model • Albedo map • Elevation map • Illuminated by • Sun (black body) • Earth (earthshine) • Specialized BRDF

  6. BRDF of the Moon • Low albedo (7%) • Reddish color • Backscattering (much brighter at full moon) • No limb darkening (uniform disc at full moon) • Constant across the surface • We decouple BRDF, spectral properties and albedo Photo by Antonio Cidadao

  7. Low Moon over cityscape

  8. Close-up of rendered stars

  9. Fish-eye view of a clear, moonless night

  10. Time-lapse rendering of stars

  11. Moon and stars over the Little Matterhorn

  12. Moon rising above a mountain

  13. Full Moon with thin layer of clouds

  14. Gibbous Moon

  15. Earthshine

  16. Quarter moon with daylight

  17. Zodiacal light

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