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Evans, Nancy Remage; Guinan, Edward; Engle, Scott; Wolk, Scott J.; Schlegel, Eric; Mason, Brian D.; Karovska, Margarita; Spitzbart, Bradley (2010). "Chandra Observation of Polaris: Census of Low-mass Companions". The Astronomical Journal. 139 (5): 1968. Bibcode: 2010AJ....139.1968E. doi: 10.1088/0004-6256/139/5/1968. Evans, N. R.; etal. (2018). "The Orbit of the Close Companion of Polaris: Hubble Space Telescope Imaging, 2007 to 2014". The Astrophysical Journal. 863 (2): 187. arXiv: 1807.06115. Bibcode: 2018ApJ...863..187E. doi: 10.3847/1538-4357/aad410. S2CID 119392532. Polaris lies at the end of the handle in the Little Dipper and can also be located by finding the Big Dipper, Ursa Major.
The North Star can also be a useful navigation aidfor determining one’s latitude in the northern horizon. It’s said that the angle from the horizon to Polaris would be the same as your latitude. Navigators used instruments like astrolabe, which calculates the position of the stars with respect to the horizon and meridian. The North Star is called that because its location is almost exactly above the North Pole. In astronomy, this point in space is called the north celestial pole, which also aligns with the Earth’s axis. As the Earth spins on its axis, all stars seem to circle around this point, while the North Star appears fixed. John’s achievement is to embed these revelations in a vivid, convincing thriller. Long passages of undigested research are mercifully absent and it never feels like a mere pretext for an info-dump John Dugdale, Sunday Times Even though the Big Dipper travels around Polaris all night long, the Big Dipper pointer stars always point to Polaris on any day of the year, and at any time of the night. How to Find the North Star
The North Star is a common theme in different works of art, tattoos, and jewelry design. It continues to be a symbol of inspiration, hope, guidance, and of finding your purpose and passion. In Brief
A superior thriller…steeped in the intrigue, culture and family of a closed regime. Andrew Gross, New York Times bestselling author Campbell, W. W. (October 1899). "On the variable velocity of Polaris in the line of sight". Publications of the Astronomical Society of the Pacific. 11: 195–199. Bibcode: 1899PASP...11..195C. doi: 10.1086/121339. S2CID 122429136. We have an easy tool to find our way around the night sky, or to guide us home when we’ve spent too much time watching Mars and avoiding bears. John moves between Jenna’s perspective, that of a North Korean official sent to negotiate with the west, and that of a North Korean woman disillusioned with the regime in a fascinating, disturbing insight into this secretive country, from its labour camps to its executions. And Williams is a gratifyingly competent protagonist to follow. “One of the most promising candidates” the CIA has ever seen, she not only has the highest IQ recorded in Virginia, she has also perfected a North Korean dialect and is a tae kwon do superstar. Go, Jenna. The Hipparcos spacecraft used stellar parallax to take measurements from 1989 and 1993 with the accuracy of 0.97 milliarcseconds (970 microarcseconds), and it obtained accurate measurements for stellar distances up to 1,000pc away. [58] The Hipparcos data was examined again with more advanced error correction and statistical techniques. [2] Despite the advantages of Hipparcos astrometry, the uncertainty in its Polaris data has been pointed out and some researchers have questioned the accuracy of Hipparcos when measuring binary Cepheids like Polaris. [9] The Hipparcos reduction specifically for Polaris has been re-examined and reaffirmed but there is still not widespread agreement about the distance. [59]a b Wielen, R.; Jahreiß, H.; Dettbarn, C.; Lenhardt, H.; Schwan, H. (2000). "Polaris: Astrometric orbit, position, and proper motion". Astronomy and Astrophysics. 360: 399–410 [400–402, 406]. arXiv: astro-ph/0002406. Bibcode: 2000A&A...360..399W. The ancient Egyptians depended upon the stars to guide them, so it’s not surprising that they also built their temples and pyramids based on astronomical positions. They even gave pyramids star-themed names like the gleaming, or pyramid that is a star. With the belief that their pharaohs became stars in the northern sky after they died, aligning the pyramids would help these rulers join the stars.
The North Star has been used as a metaphor in several poems and history plays. The most popular is William Shakespeare’s The Tragedy of Julius Caesar. In Act III, Scene I of the play, Caesar says that he is as constant as the northern star. However, scholars suggest that Caesar, who ruled in the first century BCE, would have never seen the North Star as fixed, and those poetic lines are just an astronomical anachronism. The modern name Polaris [39] is shortened from Neo-Latin stella polaris " polar star", coined in the Renaissance when the star had approached the celestial pole to within a few degrees. Some scholars suggest that the Great Pyramid of Giza was built to align with the North Star in the year 2467 BCE, which was Thuban, not Polaris. Also, the ancient Egyptians noted the two bright stars circling the North Pole and referred them as the Indestructibles. Today, these stars are known as Kochab and Mizar, which belong to the Ursa Minor and Ursa Major respectively.
Book Summary
By the way, Polaris is famous for more reasons than one. It’s famous for hardly moving while the other stars wheel around it. And it’s famous for marking the end of the Little Dipper‘s handle. The Little Dipper is tougher to spot in the night sky than the Big Dipper. But if you use the Big Dipper’s pointer stars to locate Polaris, you’ll be one step closer to seeing the Little Dipper. The Big Dipper leads you to the Little Dipper. Polaris marks the end of the handle of the Little Dipper. Its height in the sky depends on your location In a dark country sky, even when the full moon obscures a good deal of the starry heavens, the North Star is relatively easy to see. That fact has made this star a boon to travelers throughout the Northern Hemisphere, both over land and sea. So finding Polaris means you know the direction north. a b c d e f g Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752. Bibcode: 2007A&A...474..653V. doi: 10.1051/0004-6361:20078357. S2CID 18759600. An older English name, attested since the 14th century, is lodestar "guiding star", cognate with the Old Norse leiðarstjarna, Middle High German leitsterne. [46]
The single point of light that we see as Polaris is a triple star system, or three stars orbiting a common center of mass. The primary star, Polaris A, is a supergiant with about six times the mass of our sun. A close companion, Polaris Ab, orbits 2 billion miles from Polaris. You are unlikely to ever see this star, because it is too close to Polaris.
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Because Polaris lies nearly in a direct line with the Earth's rotational axis "above" the North Pole—the north celestial pole—Polaris stands almost motionless in the sky, and all the stars of the northern sky appear to rotate around it. Therefore, it makes an excellent fixed point from which to draw measurements for celestial navigation and for astrometry. The elevation of the star above the horizon gives the approximate latitude of the observer. [16] Polaris hasn’t been the only North Star—and thousands of years from now, other stars will take its place. A) The reporter John Sweeney described the North as “mad, bad, and sad,” and I couldn’t disagree. Two weeks of being fed propaganda by our tour guides became very wearying, and on at least one exasperating occasion (being told that the South started the Korean War), I was tempted to shout out “Not true!” Also bizarre was the daily ritual of having to bow before one of the many statues of Kim Il-sung (to refuse would have gotten our two guides into trouble). For such a tiny, impoverished country, North Korea hits far above its weight. Hardly a week goes by when it doesn’t make the news headlines around the world. The fact that it recently humiliated the president of the United States by successfully testing the very long-range missile he said they couldn’t (“Ain’t gonna happen”) did give me a grudging respect for the country. Sadly I think the Kim regime has a lot of influence in the region and is the reason Japan is slowly starting to abandon its pacifism of seventy years. North Korea has clearly also risen to the very top of the USA’s list of international problems. The star Polaris (α UMi) is called the North Star because it’s very close to, though not exactly on, the north celestial pole. Extend the line until you reach a star of similar brightness (about 5 x the distance of these 2 stars
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