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Globe at Night began as a NASA educational program in the US organized by the NOAO, and was expanded internationally during the 2009 International Year of Astronomy; [3] it is an offshoot of the GLOBE Program, which focuses on school-based science education.
The Geochron was the first world clock to display day and night on a world map, showing the sinh "bell curve" of light and darkness. The Geochron employs an intricate analog clockwork mechanism for its display, that shows the month, date, day of the week, hours and minutes, the areas of the world currently experiencing day and night , and the ...
A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [1] They have been used for human navigation since time immemorial. [2]
In the 2024 report "The World at Night: Preserving Natural Darkness for Heritage Conservation and Night Sky Appreciation" by the International Union for Conservation of Nature (IUCN), the multifaceted issue of light pollution is scrutinized for its detrimental effects on ecosystems, human health, cultural heritage, and its contribution to ...
The length of polar night varies by latitude from 24 hours just inside the polar circles to 179 days at the poles. As there are various kinds of twilight, there also exist various kinds of polar twilight that progress towards true polar night. Each kind of polar night is defined as when it is darker than the corresponding kind of twilight.
A dark-sky preserve (DSP) is an area, usually surrounding a park or observatory, that restricts or reduces light pollution or maintains and protects naturally dark night skies. Different terms have been used to describe these areas as national organizations and governments have worked independently to create programs.
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[S 9] A new map artist was used in A Dance with Dragons so that the maps are available in two versions by James Sinclair and Jeffrey L. Ward, depending on the book. The old maps were redone to match the style of the new ones. [S 10] A set of foldout maps was published on October 30, 2012, as The Lands of Ice and Fire (ISBN 978-0345538543). The ...