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Northern Hemisphere circumpolar stars around Polaris, with a long-exposure producing a star trail photo. A pole star is a visible star that is approximately aligned with the axis of rotation of an astronomical body; that is, a star whose apparent position is close to one of the celestial poles.
Polaris components as seen by the Hubble Space Telescope. Polaris Aa is an evolved yellow supergiant of spectral type F7Ib with 5.4 solar masses (M ☉). It is the first classical Cepheid to have a mass determined from its orbit.
Although Polaris can quickly and simply give a solution for latitude in the northern hemisphere, it can not participate in giving a position fix including longitude - it is for this reason it is excluded from the list of 57 primary navigational stars, each of which can be used to produce (in conjunction with each other, known time in relation ...
Thursday’s spacewalk took place as the vehicle orbited about 115 to 455 miles (185 to 732 kilometers) above Earth. The riskiest part of the journey may be over, but the Polaris Dawn crew still ...
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Polaris recently reported high growth in non-core businesses, such as its motorcycle and its parts, garments, and accessories, or PG&A, divisions, which saw sales grow 94% and 33%, respectively.
The Greek Marinus of Tyre (CE 70–130) was the first to assign a latitude and longitude to every place on his maps. From the late 9th century CE, the Arabian Kamal was used in equatorial regions, to measure the height of Polaris above the horizon. This instrument could only be used in latitudes where Polaris is close to the horizon.
Ursa Major and Ursa Minor in relation to Polaris. The stars Merak (β Ursae Majoris) and Dubhe (α Ursae Majoris) are known as the "pointer stars" because they are helpful for finding Polaris, also known as the North Star or Pole Star. By visually tracing a line from Merak through Dubhe (1 unit) and continuing for 5 units, one's eye will land ...