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Big Dipper
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. ==Names==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Big Dipper」の詳細全文を読む
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