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银河平面

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从地球看到的这一张星系NGC 4452的侧面视图显示了它的银河平面,星系核处于中心。
这一张螺旋星系NGC 891的侧面视图显示了有尘埃的银河平面的轮廓。

银河平面银河系主要的质量形成的盘状平面,垂直于银河平面的方向指向银极。通常的使用,在实际的情况下,"星系平面"和"星系极"这两个项目就是特指地球所在银河系的平面和极点。

有些星系是不规则的,无法明确的定义盘面,即使是像银河系一样的螺旋星系,也会因为星星没有完全共平面,也难以明确的定义出星系平面。在1959年,IAU使用1950年分点历元定义银河系的北银极的精确位置是RA= 12h49m,Dec = 27°24′;目前使用J2000历元,再修正岁差之后,它的位置是RA 12h51m26.282s,Dec 27°07′42.01″。这个位置在后发座,靠近明亮的恒星大角星;同样的,南银极在玉夫座

在1959年也定义了银河座标的"银纬0度"是的位置角距离北天极123°,因此银河赤道与银纬0度的位置是17h42m26.603s, −28°55′00.445″(B1950)或17h45m37.224s, −28°56′10.23″(J2000),同时在J2000的位置角是122.932°。银河中心的位置角是北偏东31.72°(B1950)或31.40°(J2000)。

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银河平面
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