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玄戈是中國古代星官名，屬三垣之中的紫微垣，象徵和天槍一同在天上守衛紫微垣的兵器[1]，玄戈由一星組成，在現在通用的88星座中屬於牧夫座。
清欽天監1752年編成《儀象考成》星表，玄戈增加了2顆肉眼可見的星。
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