Notable too in skygazing lore Mizar, second star from the left in the dipper's handle, forms a vision-testing visual double star with apparently close Alcor.

值得注意的还有斗柄左数第二颗星“开阳”，它与临近的“开阳增一”是一对用于测试视力的肉眼可见双星系统。

Notable too in skygazing lore Mizar, second star from the left in the dipper's handle, forms a vision-testing visual double star with apparently close Alcor.

同样显眼的还有北斗勺柄的左起第二颗星星北斗六开阳，她与北斗七玉衡组成一个测试眼力的视觉双星。

Part of the larger constellation of Ursa Major, the bright dipper stars above are named (left to right along the dipper) Dubhe, Merak, Phecda, Megrez, Alioth, Mizar/Alcor, and Alkaid.

它是大熊座巨大星群的一部分，上面明亮的北斗七星名字依次是（从左到右顺序）：天枢，天璇，天玑，天权，玉衡，开阳，摇光。