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The Big Dipper (US) or Plough (UK) is an asterism (not a constellation) of seven stars recognized as a distinct grouping in many cultures. These stars are the brightest of the formal constellation Ursa Major; six of them are second magnitude stars, while only Megrez (δ) is of third magnitude. The North Star (Polaris), the current northern pole star on Earth, can be located by extending an imaginary line from Merak (β) through Dubhe (α). This makes it useful in celestial navigation.
The constellation of Ursa Major has been seen as a bear by many distinct civilizations. This may stem from a common oral tradition stretching back for thousands of years. Using statistical and phylogenetic tools, Julien d'Huy reconstructs the following Palaeolithic state of the story: "There is an animal that is a horned herbivore, especially an elk. One human pursues this ungulate. The hunt locates or get to the sky. The animal is alive when it is transformed into a constellation. It forms the Big Dipper".
In Canada and the United States, the asterism is known as the Big Dipper because the major stars can be seen to follow the rough outline of a large ladle or "dipper". This figuration appears to be derived originally from Africa, where it was sometimes seen as a drinking gourd.
A widespread American Indian figuration had the bowl as a bear. Some groups considered the handle to be three cubs following their mother, while others pictured three hunters tracking the bear. The Anishinaabe or Ojibway First Nation know the Big Dipper as the "Fisher Star" (Ojig-anang) after the fisher cat.
Escaping slaves had to find their way north. Northern states such as New York and Massachusetts had strong abolitionist societies and benevolent groups — both black and white — that would help escaping slaves. The slaves' final goal was Canada, north of the U.S. border. Slavery was not permitted there, and American laws that allowed people to capture runaway slaves had no effect.
One of the best clues they could use to find north was to locate the North Star. The North Star is also called Polaris. Unlike other stars, it never changes position. It always points to the north.
People have always used a group of stars to help them find the North Star. They have called this group of stars many names, depending on how they saw the “picture” created by the stars. Sometimes people thought the group looked like a Big Bear. In fact, the Latin name for this star group was Ursa Major, or Big Bear.
At other times, people thought the group of stars looked like a dipper — with a cup that had a very long handle. Slaves knew this group of stars as theDrinking Gourd. They sometimes used hollowed-out gourds to dip and drink water. The gourds looked just like long-handled cups. Two stars on the cup’s edge always point to the North Star. By finding the “drinking gourd” in the sky, people traveling at night could always find the North Star.
Many escaping slaves — including Harriet Tubman, James Pennington, and Josiah Henson — may have “followed the Drinking Gourd” to freedom. Today, many people know of a song called “Follow the Drinking Gourd.” It talks about people escaping slavery by following clues to go north to freedom. The song is a combination of old ideas and new words by many musicians. 
In both Ireland and the United Kingdom, this pattern is known as the Plough. The symbol of the Starry Plough has been used as a political symbol by Irish Republican and left wing movements. Another former name was the Great Wain (i.e., wagon). In northern England, it is occasionally still known as the Butcher's Cleaver, and in the northeast, as Charlie's Wagon. This derives from the earlier Charles's Wain and Charles his Wain, which derived from the still older Carlswæn. A folk etymology holds that this derived from Charlemagne, but the name is common to all the Germanic languages and intended the churls' wagon (i.e., "the men's wagon"), in contrast with the women's wagon (the Little Dipper). An older "Odin's Wain" may have preceded these Nordic designations.
In German, it is known as the "Great Wagon" (Großer Wagen) and, less often, the "Great Bear" (Großer Bär). In Scandinavia, it is known by variations of "Charles's Wagon" (Karlavagnen, Karlsvogna, or Karlsvognen). In Dutch, its official name is the "Great Bear" (Grote Beer), but it is popularly known as the "Saucepan" (Steelpannetje).
In Romanian and most Slavic languages, it is known as the "Great Wagon" but, in Hungarian, it is commonly called "Göncöl's Wagon" (Göncölszekér) or, less often, "Big Göncöl" (Nagy Göncöl) after a táltos in Hungarian mythology who carried medicine that could cure any disease. In Finnish, the figure is known as the "Salmon Net" (Otava) and widely used as a cultural symbol. The brown bear in Finnish actually became known as otava, but this is claimed to stem from its resemblance to—and mythical origin from—the asterism rather than vice versa.
Book XVIII of Homer's Iliad mentions it as "the Bear, which men also call the Wain". In Latin, these seven stars were known as the "Seven Oxen" (septentriones, from septem triōnēs). Triōnēs is a hapax legomenon, occurring only in a single passage by Varro, where he glosses it as meaning "plough oxen". The derivation is acceptable but the meaning, if Varro is right that it derives from terō ("thresh grain by rubbing"), is surely "threshing oxen": the seven stars wheel around the pole star like oxen on a threshing floor. The name is the origin of septentriōnēs the Latin word for north, from which came the adjective septentrional ("northern") in English, French, Italian, Portuguese, and Spanish.
In traditional Chinese astronomy, which continues to be used for throughout East Asia (e.g., in astrology), these stars are generally considered to compose the Right Wall of the Purple Forbidden Enclosure which surrounds the Northern Celestial Pole, although numerous other groupings and names have been made over the centuries. Similarly, each star has a distinct name, which likewise has varied over time and depending upon the asterism being constructed. The Western asterism is now known as the "Northern Dipper" (北斗) or the "Seven Stars of the Northern Dipper" (Chinese and Japanese: 北斗七星; pinyin: Běidǒu Qīxīng; Cantonese Yale: Bak¹-dau² Cat¹-sing¹; rōmaji: Hokutō Shichisei; Korean: 북두칠성; romaja: Bukdu Chilseong; Vietnamese: Sao Bắc Đẩu). The personification of the Big Dipper itself is also known as "Doumu" (北斗) in Chinese folk religion and Taoism, and Marici in Buddhism.
In the same line of sight as Mizar, but about one light-year beyond it, is the star Alcor (80 UMa). Together they are known as the "Horse and Rider". At fourth magnitude, Alcor would normally be relatively easy to see with the unaided eye, but its proximity to Mizar renders it more difficult to resolve, and it has served as a traditional test of sight. Mizar itself has four components and thus enjoys the distinction of being part of an optical binary as well as being the first-discovered telescopic binary (1617) and the first-discovered spectroscopic binary (1889).
Five of the stars of the Big Dipper are at the core of the Ursa Major Moving Group. The two at the ends, Dubhe and Alkaid, are not part of the swarm, and are moving in the opposite direction. Relative to the central five, they are moving down and to the right in the map. This will slowly change the Dipper's shape, with the bowl opening up and the handle becoming more bent. In 50,000 years the Dipper will no longer exist as we know it, but be re-formed into a new Dipper facing the opposite way. The stars Alkaid to Phecda will then constitute the bowl, while Phecda, Merak, and Dubhe will be the handle.
Not only are the stars in the Big Dipper easily found themselves, they may also be used as guides to yet other stars. Thus it is often the starting point for introducing Northern Hemisphere beginners to the night sky:
- Polaris, the North Star, is found by imagining a line from Merak (β) to Dubhe (α) and then extending it for five times the distance between the two Pointers.
- Extending a line from Megrez (δ) to Phecda (γ), on the inside of the bowl, leads to Regulus (α Leonis) and Alphard (α Hydrae). A mnemonic for this is "A hole in the bowl will leak on Leo."
- Crossing the top of the bowl from Megrez (δ) to Dubhe (α) takes one in the direction of Capella (α Aurigae). A mnemonic for this is "Cap to Capella."
- Castor (α Geminorum) is reached by imagining a diagonal line from Megrez (δ) to Merak (β) and then extending it for approximately five times that distance.
- By following the curve of the handle from Alioth (ε) to Mizar (ζ) to Alkaid (η), one reaches Arcturus (α Boötis) and Spica (α Virginis). A mnemonic for this is "Arc to Arcturus then speed (or spike) to Spica."
Additionally, the Dipper may be used as a guide to telescopic objects:
- The approximate location of the Hubble Deep Field can be found by following a line from Phecda (γ) to Megrez (δ) and continuing on for the same distance again.
- Crossing the bowl diagonally from Phecda (γ) to Dubhe (α) and proceeding onward for a similar stretch leads to the bright galaxy pair M81 and M82.
- Two spectacular spiral galaxies flank Alkaid (η), the Pinwheel (M101) to the north and the Whirlpool (M51) to the south.
- Projecting a line from Alkaid through the pole star will point to Cassiopeia.
||This section may contain excessive, poor, or irrelevant examples. (September 2014)|
In Tolkien's Middle-earth mythos, it is called the Valacirca (Sickle of the Valar), the sign of Hope signifying doom for Evil, while in T.A. Barron's Great Tree of Avalon series, it is called the Wizard's Staff, symbolizing Merlin's staff.
It is a prominent symbol in the Fist of the North Star manga/anime series; Kenshiro, has scars on his chest in the Big Dipper's configuration. In fact the original Japanese name "Hokuto no Ken" means "Fist of the Great Dipper". It is identified as an omen: "When the great bear appears, violence will follow."
In the manga X/1999 and its anime adaptation, it serves as a major recurring theme of the series mythos.
In the video game Shin Megami Tensei: Devil Survivor 2, the seven stars of the Big Dipper (known as Septentriones) appear as the primary antagonists of the game, while Polaris serves as the game's final boss.
In the video game Uncharted 3: Drake's Deception, the player has to find the big dipper in the sky.
In the video game Monster Hunter 3, the seven stars of the Big Dipper appear as names of weapons of different classes all titled as the name of the star followed by Asterism in reference to this constellation.
In the Yu-Gi-Oh! Zexal anime, the Seven Barian Emperors have names based on stars of Big Dipper.
In the 13th Movie of the Case Closed Anime (Detective Conan) the Big Dipper plays a vital role for the criminals actions.
In the Disney Channel's animated series Gravity Falls, the main character's nickname is Dipper, due to the Big Dipper birthmark on his forehead.
In addition to appearing on the flags of political entities, the Dipper has also been used in corporate logos.
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- Rao, Joe (9 May 2008). "Doorstep Astronomy: See the Big Dipper". space.com. Retrieved 31 August 2013.
- Gibbon, William B. (1964). "Asiatic parallels in North American star lore: Ursa Major". Journal of American Folklore 77 (305): 236–250. doi:10.2307/537746.
- Bradley E Schaefer, The Origin of the Greek Constellations: Was the Great Bear constellation named before hunter nomads first reached the Americas more than 10 years ago!', Scientific American, November 2006, reviewed at The Origin of the Greek Constellations; Yuri Berezkin, The cosmic hunt: variants of a Siberian – North-American myth. Folklore, 31, 2005: 79-100.
- d'Huy Julien, Un ours dans les étoiles: recherche phylogénétique sur un mythe préhistorique, Préhistoire du sud-ouest, 20 (1), 2012: 91-106; A Cosmic Hunt in the Berber sky : a phylogenetic reconstruction of Palaeolithic mythology, Les Cahiers de l'AARS, 15, 2012.
- Hinckley Allen, Richard (1963). "Star Names: Their Lore and Meaning – "Ursa Major"".
- Bågenholm, Gösta. "Astro ordlista: Karlavagnen" [Astrological glossary: The Big Dipper]. 150 ord och begrepp inom astronomisk navigation (in Swedish). Archived from the original on 3 December 2005.
"Som pendang till Karlavagnen kallas Lilla björn (latin Ursæ Minoris) för kvinnovagnen..." — as an appendix to the Men's Wagon, the Little Bear is called the Women's Wagon
- Hellquist, Elof (1922). Svensk etymologisk ordbok [Sewdish etymological dictionary] (in Swedish).
Karlavagnen: "I stället sammansatt" ... – "Instead composed from the appellative karl [man] in opposition to Icelandic kvennavagn [women's wagon]"
- Kaisa, Häkkinen (2007). Nykysuomen etymologinen sanakirja (in Finnish) (4th ed.). WSOY. ISBN 978-951-0-27108-7.
- Hämäläinen, Pirjo (11 November 2013). "Otavassa on orjan merkki". Kansan Uutiset (in Finnish). Retrieved 21 April 2014.
- Mykrä, Sakari. "Kahdensadan nimen kontio". Suurpedot.fi (in Finnish). Retrieved 21 April 2014.
- Homer. "Book XVII". The Iliad. translated by Samuel Butler.
- In Latin, short vowels often syncopate before -r- in medial syllables.
- See their individual pages.
- Amos 5:8.
- Allen P. Adamson; Martin Sorrell (2007). Brandsimple: how the best brands keep it simple and succeed. Palgrave Macmillan. p. 101. ISBN 978-1-4039-8490-6. For an example see Iridium Satellite LLC.