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4 results for “Star trails”
Star Trails
<p>Honorable mention in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Star Trails, by Govind Gurjar.</p> <p>Taken in the darkness of Panotiya, Amartiya village, India, this image from October 2022 showcases beautiful star trails painting the night sky, receiving an honourable mention in the category of Still images taken exclusively with smartphones/mobile devices. With only a smartphone and a tripod, the photographer captured these trails — visual evidence of our planet's rotation, as each streak represents the apparent movement of the stars as the Earth spins, creating a captivating cosmic choreography of light. The distinct colours of the stars — some gleaming blue, others whitish — hint at their varying temperatures and compositions. Additionally, a subtle streak of an aeroplane momentarily intersects the timeless dance of the stars, juxtaposing the serene heavens with the bustling activity of life below.</p> <p>Credit: Govind Gurjar/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Star Trail in the Southern Hemisphere with Bortle 4 Scale Light Pollution
<p>Winner in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Star Trail in the Southern Hemisphere with Bortle 4 Scale Light Pollution, by Slamat Riyadi.</p> <p>This breathtaking photo, captured under the clear night sky of Linggamekar Village, Cilimus, Kuningan, West Java, Indonesia on 25 June 2020, displays star trails sweeping across the southern hemisphere’s heavens. The star trails are due to Earth’s rotation causing the apparent motion of stars, creating these mesmerising arcs of light when followed over extended periods. Here, the point the stars rotate around (the South Celestial Pole) is close to the horizon, as the image was taken close to the equator. The photographer used the star trail feature on a smartphone, which captured a series of images over an extended period and stacked them together. The striking tree in the foreground adds depth to the image, contrasting the celestial motion above with its Earthly stillness, while also masking some of the surrounding light pollution. Different parts of the world offer diverse and stunning perspectives on the night sky, emphasising the importance of preserving dark skies everywhere.</p> <p>Credit: Slamat Riyadi/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Star Trails of the Forbidden City
<p>Honorable mention in the 2023 IAU OAE Astrophotography Contest, category Still images with smartphones-mobile devices: Star Trails of the Forbidden City, by Stephanie Ziyi Ye.</p> <p>Beneath the celestial ballet of star trails that weave their way across the night sky, the Beijing Forbidden City stands as a testament to ancient celestial connections in this image captured in March 2022. Designed with a cosmic alignment in mind, the palace echoes the orientation of the North Star, also known as Polaris, a celestial anchor that has long guided navigators and symbolised steadiness in the sky. It was believed that the Emperor embodied the earthly representation of this pole star, bridging the realms between heaven and earth. In this harmonious one-hour exposure captured with a smartphone, the streaks of stars trace their nightly journey across the firmament, converging toward the North Star, reflecting the precision of both architectural design and celestial paths. The image receives an honourable mention in the category of Still images taken exclusively with smartphones/mobile devices.</p> <p>Credit: Stephanie Ziyi Ye/IAU OAE (<a href="https://creativecommons.org/licenses/by/4.0/legalcode">CC BY 4.0</a>)</p>
Star Trails And Lava Plume on Mount Etna February 2021, by Dario Giannobile, Italy
<p>Third place in the IAU OAE Astrophotography Contest, category Star trails.</p> <p>This spectacular image captures some of the most dramatic expressions of Nature, the eruption of a volcano and the night sky. The volcano in the foreground is Mount Etna, located in Sicily/Italy, during an eruption in February 2021. In the background, we can see the star trails resulting from the Earth's motion around its imaginary axis. As Mount Etna is located about 37° N, we can notice that the arcs are quite open, as this is far from the North Pole, from where the view from the sky would provide traces drawing circles. As we move to the Equator, either from the Southern or Northern Hemisphere, the star traces become more and more parallel, instead of circular, as the viewer moves away from the zenith pointing to one of the Earth's rotational axes. Therefore, the sky presents us with valuable information about location and time and was an important practice for ancient civilizations to follow the movement of the celestial bodies. The image also captures the varying colours of stars which result from differece in the temperature of stars: higher temperature stars are bluer, compared to the lower temperature white and red stars.</p> <p>Credit: Dario Giannobile/IAU OAE</p>
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