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The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...
subscription uTalk 140+ 27 online and mobile app: subscription Eurotalk: 132: 119 application: Transparent Language Online: 130: 6 online and mobile app: monthly or yearly subscription, or free via a participating library Peace Corps: 101: 1 (English) web: free Pronunciator: 87: 50 free to library patrons if library pays Assimil: 76: 12 books ...
The Jizera Dark Sky Park (Polish: Izerski Park Ciemnego Nieba - IPCN, Czech: Jizerská oblast tmavé oblohy - JOTO) is the first transnational dark-sky preserve. It is located in a nearly-uninhabited region of the Jizera Mountains that lies halfway between Poland and the Czech Republic. The park primarily serves to inform the general public ...
Language, music, and mathematics courses and language assessment. Duolingo, Inc., [b] is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on music, [5] math, [6] and 43 languages, [7] ranging from English, French, and Spanish to less commonly studied languages ...
The International Dark-Sky Association ( IDA) is a United States-based non-profit organization incorporated in 1988 by founders David Crawford, a professional astronomer, and Tim Hunter, a physician and amateur astronomer. The mission of the IDA is "to preserve and protect the night time environment and our heritage of dark skies through ...
A dark-sky preserve status enables high-quality astronomical observation in Paranal Observatory. [1] 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 ...
Altair is the brightest star in the constellation Aquila. α Aquilae (Latinised to Alpha Aquilae) is the star's Bayer designation. The traditional name Altair has been used since medieval times. It is an abbreviation of the Arabic phrase النسر الطائرAl-Nisr Al-Ṭa'ir, " the flying eagle ".
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. In the field of astronomy, the sky is also called the celestial sphere.