Translation guide
The North Star, a fixed point in the night sky used for navigation. In Japanese, it is most commonly referred to by its astronomical name or descriptive phrases.
Referring to the specific star Polaris in an astronomical or scientific context.
The direct loanword from English, commonly used in modern astronomical contexts, planetariums, and popular science.
ポラリスはこぐま座の一番明るい星です。
Polaris is the brightest star in the constellation Ursa Minor.
Literally 'North Pole Star', the traditional Japanese term for Polaris. Used in both scientific and everyday contexts.
北極星はほとんど動かないので、航海の目印になります。
Since Polaris barely moves, it serves as a navigational marker.
A classical Chinese-derived term for the North Star, often found in literature, poetry, or traditional contexts. It carries a sense of constancy and guidance.
古来、北辰は不動の象徴とされてきた。
Since ancient times, the North Star has been regarded as a symbol of immutability.
Using Polaris as a metaphor for something that provides direction, stability, or a fixed point of reference.
Both 北極星 and ポラリス can be used metaphorically to mean a guiding principle or unwavering standard, similar to English. 北極星 is more common in traditional or philosophical contexts, while ポラリス may appear in modern branding or creative works.
彼の信念は、人生における北極星のようなものだ。
His beliefs are like a Polaris in his life.
この理念が私たちのポラリスです。
This principle is our Polaris.
If the metaphor feels too direct or literary, more natural Japanese alternatives for 'guide' or 'guiding principle' are 道しるべ (guidepost) or 指針 (guideline). These convey the idea without the astronomical reference.
この本は私の人生の道しるべとなった。
This book became the Polaris of my life.
北極星 is the standard Japanese term and is widely understood. ポラリス is a loanword used in astronomy, science communication, and sometimes in creative naming. In everyday conversation about the night sky, 北極星 is more natural.