Μετάφραση και ανάλυση λέξεων από τεχνητή νοημοσύνη
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- χρησιμοποιείται πιο συχνά στον προφορικό ή γραπτό λόγο
- επιλογές μετάφρασης λέξεων
- παραδείγματα χρήσης (πολλές φράσεις με μετάφραση)
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Τι (ποιος) είναι north star - ορισμός
![Polaris pictured in the flag of [[Nunavut]]](https://commons.wikimedia.org/wiki/Special:FilePath/Flag of Nunavut.svg?width=200 "Polaris pictured in the flag of [[Nunavut]]")
![integrated flux nebula.]]](https://commons.wikimedia.org/wiki/Special:FilePath/Integrated Flux Nebula Surrounding Polaris - Kush Chandaria.jpg?width=200 "integrated flux nebula.]]")
![Polaris components as seen by the [[Hubble Space Telescope]]](https://commons.wikimedia.org/wiki/Special:FilePath/Polaris alpha ursae minoris.jpg?width=200 "Polaris components as seen by the [[Hubble Space Telescope]]")
![[[Big Dipper]] and [[Ursa Minor]] in relation to Polaris](https://commons.wikimedia.org/wiki/Special:FilePath/Ursa Major - Ursa Minor - Polaris.jpg?width=200 "[[Big Dipper]] and [[Ursa Minor]] in relation to Polaris")
![A typical Northern Hemisphere [[star trail]] with Polaris in the center.](https://commons.wikimedia.org/wiki/Special:FilePath/Star Trail above Beccles - geograph.org.uk - 1855505.jpg?width=200 "A typical Northern Hemisphere [[star trail]] with Polaris in the center.")
 lining Guthrie Rapids.JPG?width=200)
Βικιπαίδεια
Polaris is a star in the northern circumpolar constellation of Ursa Minor. It is designated α Ursae Minoris (Latinized to Alpha Ursae Minoris) and is commonly called the North Star or Pole Star. With an apparent magnitude that fluctuates around 1.98, it is the brightest star in the constellation and is readily visible to the naked eye at night. The position of the star lies less than 1° away from the north celestial pole, making it the current northern pole star. The stable position of the star in the Northern Sky makes it useful for navigation.
As the closest Cepheid variable its distance is used as part of the cosmic distance ladder. The revised Hipparcos stellar parallax gives a distance to Polaris of about 433 light-years (133 parsecs), while the successor mission Gaia gives a distance of about 448 light-years (137 parsecs). Calculations by other methods vary widely.
Although appearing to the naked eye as a single point of light, Polaris is a triple star system, composed of the primary, a yellow supergiant designated Polaris Aa, in orbit with a smaller companion, Polaris Ab; the pair is in a wider orbit with Polaris B. The outer pair AB were discovered in August 1779 by William Herschel, where the 'A' refers to what is now known to be the Aa/Ab pair.
