noun
Rare astronomical term for Polaris; the common Japanese name is ポラリス.
See also: ポラリス
天帝星は、こぐま座のα星で、北極星として知られる。
天帝星 is the alpha star of Ursa Minor, known as the North Star.
北極星 is the standard Japanese word for 'North Star' or 'pole star'; 天帝星 specifically refers to Polaris as the current North Star.
Composed of 天帝 (heavenly emperor) and 星 (star), likely a calque or traditional Chinese astronomical name for Polaris.