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Ursa Major and Polaris with names of bright stars in the Big Dipper The constellation Ursa Major as it can be seen by the unaided eye The outline of the seven bright stars of Ursa Major form the asterism known as the " Big Dipper " in the United States and Canada, while in the United Kingdom it is called the Plough [ 6 ] or (historically ...
The Big Dipper seen from Fujian. The constellation of Ursa Major (Latin: Greater Bear) has been seen as a bear, a wagon, or a ladle.The "bear" tradition is Indo-European (appearing in Greek, as well as in Vedic India), [7] but apparently the name "bear" has parallels in Siberian or North American traditions.
To take into account such movement, celestial pole definitions come with an epoch to specify the date of the rotation axis; J2000.0 is the current standard. An analogous concept applies to other planets: a planet's celestial poles are the points in the sky where the projection of the planet's axis of rotation intersects the celestial sphere.
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 lying halfway between the asterisms Cassiopeia and the Big Dipper. 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.
The circumpolar stars move clockwise around Sigma Octantis. East and west are not interchanged. As seen from the Equator, the two celestial poles are on the horizon due north and south, and the motion is counterclockwise (i.e. leftward) around Polaris and clockwise (i.e. rightward) around Sigma Octantis. All motion is westward, except for the ...
The Big Dipper asterism. The Big Dipper, also known as The Plough or Charles's Wain, is composed of the seven brightest stars in Ursa Major. [5] These stars delineate the Bear's hindquarters and exaggerated tail, or alternatively, the "handle" forming the upper outline of the bear's head and neck.
It is more familiar to northern hemisphere observers as one of the "pointer stars" in the Big Dipper, or the Plough (UK), which is a prominent asterism of seven stars that forms part of the larger constellation. Extending an imaginary straight line from this star through the nearby Alpha Ursae Majoris (Dubhe) extends to Polaris, the north star.